sam c21 family - microchip technologyww1.microchip.com/downloads/en/devicedoc/60001479a.pdf–...

SAM C21 Family 32-bit Cortex M0+ with 5V support, CAN-FD, PTC and

Advanced Analog

Introduction

The SAM C21 is a series of microcontrollers optimized for industrial automation, appliances and other 5Vapplications using the 32-bit ARM Cortex-M0+ processor, ranging from 32- to 100-pins with up to256KB Flash and 32KB of SRAM and operate at a maximum frequency of 48MHz and reach 2.46CoreMark/MHz. The SAM C21 devices are designed for simple and intuitive migration with identicalperipheral modules, hex compatible code, identical linear address map and pin compatible migrationpaths between all devices in the product series. All devices include intelligent and flexible peripherals,Event System for inter-peripheral signaling, and support for capacitive touch button, slider and wheel userinterfaces.

SAM C21 devices are pin compatible to the SAM D and SAM C family of general purposemicrocontrollers.

Features

Processor ARM Cortex-M0+ CPU running at up to 48MHz

Single-cycle hardware multiplier Micro Trace Buffer Memory Protection Unit (MPU)

Memories 32/64/128/256KB in-system self-programmable Flash 1/2/4/8KB independent self-programmable Flash for EEPROM emulation 4/8/16/32KB SRAM Main Memory

System Power-on reset (POR) and brown-out detection (BOD) Internal and external clock options with 48MHz to 96MHz Fractional Digital Phase Locked

Loop (FDPLL96M) External Interrupt Controller (EIC) (Interrupt pin debouncing is only available in SAM C21N) 16 external interrupts

Hardware debouncing (only on the 100Pin TQFP) One non-maskable interrupt Two-pin Serial Wire Debug (SWD) programming, test and debugging interface

Low Power Idle and standby sleep modes SleepWalking peripherals

2017 Microchip Technology Inc. Datasheet Complete 60001479A-page 1

Peripherals Hardware Divide and Square Root Accelerator (DIVAS) 12-channel Direct Memory Access Controller (DMAC) 12-channel Event System Up to eight 16-bit Timer/Counters (TC), configurable as either(2):

One 16-bit TC with compare/capture channels One 8-bit TC with compare/capture channels One 32-bit TC with compare/capture channels, by using two TCs

Two 24-bit Timer/Counters and one 16-bit Timer/Counter for Control (TCC), with extendedfunctions:

Up to four compare channels with optional complementary output Generation of synchronized pulse width modulation (PWM) pattern across port pins Deterministic fault protection, fast decay and configurable dead-time between

complementary output Dithering that increase resolution with up to 5 bit and reduce quantization error

Frequency Meter (The division reference clock is only available in the SAM C21N) 32-bit Real Time Counter (RTC) with clock/calendar function Watchdog Timer (WDT) CRC-32 generator Up to two Controller Area Network (CAN) interfaces:

CAN 2.0A/B CAN-FD 1.0

Each CAN interface have two selectable pin locations to switch between two externalCAN transceivers (without the need for an external switch)

Up to eight Serial Communication Interfaces (SERCOM), each configurable to operate as either: USART with full-duplex and single-wire half-duplex configuration I2C up to 3.4MHz (Except SERCOM6 and SERCOM7) SPI LIN master/slave RS-485 PMBus

One Configurable Custom Logic (CCL) Two 12-bit, 1Msps Analog-to-Digital Converter (ADC) with up to 12 channels each (20 unique

channels in total) Differential and single-ended input Automatic offset and gain error compensation Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution

One 16-bit Sigma-Delta Analog-to-Digital Converter (SDADC) with up to 3 differential channels 10-bit, 350ksps Digital-to-Analog Converter (DAC) Four Analog Comparators (AC) with window compare function Integrated Temperature Sensor Peripheral Touch Controller (PTC)

256-Channel capacitive touch and proximity sensing I/O

SAM C21 Family


Up to 84 programmable I/O pins Drop in compatible with SAM D20 and SAM D21(1)

Packages 100-pin TQFP 64-pin TQFP, QFN 56-pin WLCSP 48-pin TQFP, QFN 32-pin TQFP, QFN

Operating Voltage 2.7V 5.5V

1. Only applicable for 32-, 48- and 64-pin TQFP and QFN packages.2. Maximum and minimum capture is only available in SAM C21N

SAM C21 Family


Table of Contents

Introduction......................................................................................................................1

Features.......................................................................................................................... 1

1. Description...............................................................................................................14

2. Configuration Summary...........................................................................................15

3. Ordering Information................................................................................................173.1. SAM C21E..................................................................................................................................173.2. SAM C21G................................................................................................................................. 183.3. SAM C21J.................................................................................................................................. 193.4. SAM C21N................................................................................................................................. 203.5. Device Identification................................................................................................................... 20

4. Block Diagram......................................................................................................... 22

5. Pinout...................................................................................................................... 255.1. SAM C21E..................................................................................................................................255.2. SAM C21G................................................................................................................................. 265.3. SAM C21J.................................................................................................................................. 275.4. SAM C21N................................................................................................................................. 29

6. Signal Descriptions List........................................................................................... 30

7. I/O Multiplexing and Considerations........................................................................327.1. Multiplexed Signals.................................................................................................................... 327.2. Other Functions..........................................................................................................................35

8. Power Supply and Start-Up Considerations............................................................ 388.1. Power Domain Overview............................................................................................................388.2. Power Supply Considerations.................................................................................................... 398.3. Power-Up................................................................................................................................... 418.4. Power-On Reset and Brown-Out Detector.................................................................................41

9. Product Mapping..................................................................................................... 43

10. Memories.................................................................................................................4510.1. Embedded Memories................................................................................................................. 4510.2. Physical Memory Map................................................................................................................4510.3. NVM User Row Mapping............................................................................................................4610.4. NVM Software Calibration Area Mapping...................................................................................4710.5. NVM Temperature Calibration Area Mapping.............................................................................4810.6. Serial Number............................................................................................................................ 48

11. Processor and Architecture..................................................................................... 50

SAM C21 Family


11.1. Cortex M0+ Processor............................................................................................................... 5011.2. Nested Vector Interrupt Controller..............................................................................................5211.3. Micro Trace Buffer......................................................................................................................5411.4. High-Speed Bus System............................................................................................................ 54

12. PAC - Peripheral Access Controller.........................................................................5712.1. Overview.................................................................................................................................... 5712.2. Features..................................................................................................................................... 5712.3. Block Diagram............................................................................................................................5712.4. Product Dependencies...............................................................................................................5712.5. Functional Description................................................................................................................5812.6. Register Summary......................................................................................................................6212.7. Register Description...................................................................................................................63

13. Peripherals Configuration Summary........................................................................7613.1. SAM C21N................................................................................................................................. 7613.2. SAM C21J, G, E.........................................................................................................................78

14. DSU - Device Service Unit...................................................................................... 8114.1. Overview.................................................................................................................................... 8114.2. Features..................................................................................................................................... 8114.3. Block Diagram............................................................................................................................8114.4. Signal Description...................................................................................................................... 8114.5. Product Dependencies...............................................................................................................8214.6. Debug Operation........................................................................................................................8314.7. Chip Erase..................................................................................................................................8414.8. Programming..............................................................................................................................8514.9. Intellectual Property Protection.................................................................................................. 8514.10. Device Identification...................................................................................................................8714.11. Functional Description................................................................................................................8814.12. Register Summary..................................................................................................................... 9314.13. Register Description...................................................................................................................95

15. DIVAS Divide and Square Root Accelerator.......................................................11715.1. Overview...................................................................................................................................11715.2. Features................................................................................................................................... 11715.3. Block Diagram.......................................................................................................................... 11715.4. Signal Description.....................................................................................................................11715.5. Product Dependencies............................................................................................................. 11715.6. Functional Description.............................................................................................................. 11815.7. Register Summary....................................................................................................................12115.8. Register Description.................................................................................................................121

16. Clock System.........................................................................................................12816.1. Clock Distribution..................................................................................................................... 12816.2. Synchronous and Asynchronous Clocks..................................................................................12916.3. Register Synchronization......................................................................................................... 12916.4. Enabling a Peripheral...............................................................................................................13116.5. On-demand, Clock Requests................................................................................................... 131

SAM C21 Family


16.6. Power Consumption vs. Speed................................................................................................13216.7. Clocks after Reset....................................................................................................................132

17. GCLK - Generic Clock Controller.......................................................................... 13317.1. Overview.................................................................................................................................. 13317.2. Features................................................................................................................................... 13317.3. Block Diagram..........................................................................................................................13317.4. Signal Description.................................................................................................................... 13417.5. Product Dependencies.............................................................................................................13417.6. Functional Description..............................................................................................................13517.7. Register Summary....................................................................................................................14017.8. Register Description.................................................................................................................141

18. MCLK Main Clock...............................................................................................14918.1. Overview.................................................................................................................................. 14918.2. Features................................................................................................................................... 14918.3. Block Diagram..........................................................................................................................14918.4. Signal Description.................................................................................................................... 14918.5. Product Dependencies.............................................................................................................14918.6. Functional Description..............................................................................................................15118.7. Register Summary - MCLK...................................................................................................... 15618.8. Register Description.................................................................................................................156

19. RSTC Reset Controller.......................................................................................16919.1. Overview.................................................................................................................................. 16919.2. Features................................................................................................................................... 16919.3. Block Diagram..........................................................................................................................16919.4. Signal Description.................................................................................................................... 16919.5. Product Dependencies.............................................................................................................16919.6. Functional Description..............................................................................................................17019.7. Register Summary....................................................................................................................17319.8. Register Description.................................................................................................................173

20. PM Power Manager............................................................................................17420.1. Overview.................................................................................................................................. 17420.2. Features................................................................................................................................... 17420.3. Block Diagram..........................................................................................................................17420.4. Signal Description.................................................................................................................... 17420.5. Product Dependencies.............................................................................................................17420.6. Functional Description..............................................................................................................17520.7. Register Summary....................................................................................................................17920.8. Register Description.................................................................................................................179

21. OSCCTRL Oscillators Controller........................................................................18121.1. Overview.................................................................................................................................. 18121.2. Features................................................................................................................................... 18121.3. Block Diagram..........................................................................................................................18221.4. Signal Description.................................................................................................................... 18221.5. Product Dependencies.............................................................................................................182

SAM C21 Family


21.6. Functional Description..............................................................................................................18321.7. Register Summary....................................................................................................................19321.8. Register Description.................................................................................................................194

22. OSC32KCTRL 32KHz Oscillators Controller......................................................21522.1. Overview.................................................................................................................................. 21522.2. Features................................................................................................................................... 21522.3. Block Diagram..........................................................................................................................21622.4. Signal Description.................................................................................................................... 21622.5. Product Dependencies.............................................................................................................21622.6. Functional Description..............................................................................................................21822.7. Register Summary....................................................................................................................22422.8. Register Description.................................................................................................................224

23. SUPC Supply Controller.....................................................................................23623.1. Overview.................................................................................................................................. 23623.2. Features................................................................................................................................... 23623.3. Block Diagram..........................................................................................................................23723.4. Signal Description.................................................................................................................... 23723.5. Product Dependencies.............................................................................................................23723.6. Functional Description..............................................................................................................23823.7. Register Summary....................................................................................................................24323.8. Register Description.................................................................................................................243

24. WDT Watchdog Timer........................................................................................ 25424.1. Overview.................................................................................................................................. 25424.2. Features................................................................................................................................... 25424.3. Block Diagram..........................................................................................................................25524.4. Signal Description.................................................................................................................... 25524.5. Product Dependencies.............................................................................................................25524.6. Functional Description..............................................................................................................25624.7. Register Summary....................................................................................................................26224.8. Register Description.................................................................................................................262

25. RTC Real-Time Counter.....................................................................................26925.1. Overview.................................................................................................................................. 26925.2. Features................................................................................................................................... 26925.3. Block Diagram..........................................................................................................................26925.4. Signal Description.................................................................................................................... 27025.5. Product Dependencies.............................................................................................................27025.6. Functional Description..............................................................................................................27225.7. Register Summary - COUNT32................................................................................................27825.8. Register Description - COUNT32.............................................................................................27825.9. Register Summary - COUNT16................................................................................................28925.10. Register Description - COUNT16.............................................................................................28925.11. Register Summary - CLOCK....................................................................................................30025.12. Register Description - CLOCK................................................................................................. 300

26. DMAC Direct Memory Access Controller........................................................... 312

SAM C21 Family


26.1. Overview.................................................................................................................................. 31226.2. Features................................................................................................................................... 31226.3. Block Diagram..........................................................................................................................31426.4. Signal Description.................................................................................................................... 31426.5. Product Dependencies.............................................................................................................31426.6. Functional Description..............................................................................................................31526.7. Register Summary....................................................................................................................33626.8. Register Description.................................................................................................................33726.9. Register Summary - SRAM......................................................................................................36326.10. Register Description - SRAM................................................................................................... 363

27. EIC External Interrupt Controller........................................................................ 37027.1. Overview.................................................................................................................................. 37027.2. Features................................................................................................................................... 37027.3. Block Diagram..........................................................................................................................37027.4. Signal Description.................................................................................................................... 37127.5. Product Dependencies.............................................................................................................37127.6. Functional Description..............................................................................................................37227.7. Register Summary....................................................................................................................37927.8. Register Description.................................................................................................................380

28. NVMCTRL Non-Volatile Memory Controller....................................................... 39328.1. Overview.................................................................................................................................. 39328.2. Features................................................................................................................................... 39328.3. Block Diagram..........................................................................................................................39328.4. Signal Description.................................................................................................................... 39428.5. Product Dependencies.............................................................................................................39428.6. Functional Description..............................................................................................................39528.7. Register Summary....................................................................................................................40328.8. Register Description.................................................................................................................404

29. PORT - I/O Pin Controller......................................................................................41529.1. Overview.................................................................................................................................. 41529.2. Features................................................................................................................................... 41529.3. Block Diagram..........................................................................................................................41629.4. Signal Description.................................................................................................................... 41629.5. Product Dependencies.............................................................................................................41629.6. Functional Description..............................................................................................................41829.7. Register Summary....................................................................................................................42429.8. PORT Pin Groups and Register Repetition..............................................................................42629.9. Register Description.................................................................................................................426

30. EVSYS Event System........................................................................................ 44430.1. Overview.................................................................................................................................. 44430.2. Features................................................................................................................................... 44430.3. Block Diagram..........................................................................................................................44430.4. Signal Description.................................................................................................................... 44530.5. Product Dependencies.............................................................................................................44530.6. Functional Description..............................................................................................................446

SAM C21 Family


30.7. Register Summary....................................................................................................................45030.8. Register Description.................................................................................................................451

31. SERCOM Serial Communication Interface.........................................................46631.1. Overview.................................................................................................................................. 46631.2. Features................................................................................................................................... 46631.3. Block Diagram..........................................................................................................................46731.4. Signal Description.................................................................................................................... 46731.5. Product Dependencies.............................................................................................................46731.6. Functional Description..............................................................................................................469

32. SERCOM USART SERCOM Universal Synchronous and Asynchronous Receiverand Transmitter......................................................................................................47532.1. Overview.................................................................................................................................. 47532.2. USART Features...................................................................................................................... 47532.3. Block Diagram..........................................................................................................................47632.4. Signal Description.................................................................................................................... 47632.5. Product Dependencies.............................................................................................................47632.6. Functional Description..............................................................................................................47832.7. Register Summary....................................................................................................................49132.8. Register Description.................................................................................................................491

33. SERCOM SPI SERCOM Serial Peripheral Interface..........................................51033.1. Overview.................................................................................................................................. 51033.2. Features................................................................................................................................... 51033.3. Block Diagram.......................................................................................................................... 51133.4. Signal Description.....................................................................................................................51133.5. Product Dependencies............................................................................................................. 51133.6. Functional Description..............................................................................................................51333.7. Register Summary....................................................................................................................52233.8. Register Description.................................................................................................................523

34. SERCOM I2C SERCOM Inter-Integrated Circuit................................................ 53634.1. Overview.................................................................................................................................. 53634.2. Features................................................................................................................................... 53634.3. Block Diagram..........................................................................................................................53734.4. Signal Description.................................................................................................................... 53734.5. Product Dependencies.............................................................................................................53734.6. Functional Description..............................................................................................................53934.7. Register Summary - I2C Slave.................................................................................................55734.8. Register Description - I2C Slave...............................................................................................55734.9. Register Summary - I2C Master...............................................................................................57134.10. Register Description - I2C Master............................................................................................ 572

35. CAN - Control Area Network................................................................................. 58835.1. Overview.................................................................................................................................. 58835.2. Features................................................................................................................................... 58835.3. Block Diagram..........................................................................................................................588

SAM C21 Family


35.4. Signal Description.................................................................................................................... 58935.5. Product Dependencies.............................................................................................................58935.6. Functional Description..............................................................................................................59035.7. Register Summary....................................................................................................................61135.8. Register Description.................................................................................................................61535.9. Message RAM..........................................................................................................................676

36. TC Timer/Counter...............................................................................................68636.1. Overview.................................................................................................................................. 68636.2. Features................................................................................................................................... 68636.3. Block Diagram..........................................................................................................................68736.4. Signal Description.................................................................................................................... 68736.5. Product Dependencies.............................................................................................................68836.6. Functional Description..............................................................................................................68936.7. Register Description.................................................................................................................705

37. TCC Timer/Counter for Control Applications...................................................... 75737.1. Overview.................................................................................................................................. 75737.2. Features................................................................................................................................... 75737.3. Block Diagram..........................................................................................................................75837.4. Signal Description.................................................................................................................... 75837.5. Product Dependencies.............................................................................................................75937.6. Functional Description..............................................................................................................76037.7. Register Summary....................................................................................................................79437.8. Register Description.................................................................................................................796

38. CCL Configurable Custom Logic........................................................................83338.1. Overview.................................................................................................................................. 83338.2. Features................................................................................................................................... 83338.3. Block Diagram..........................................................................................................................83438.4. Signal Description.................................................................................................................... 83438.5. Product Dependencies.............................................................................................................83438.6. Functional Description..............................................................................................................83638.7. Register Summary....................................................................................................................84638.8. Register Description.................................................................................................................846

39. ADC Analog-to-Digital Converter........................................................................85039.1. Overview.................................................................................................................................. 85039.2. Features................................................................................................................................... 85039.3. Block Diagram..........................................................................................................................85139.4. Signal Description.................................................................................................................... 85139.5. Product Dependencies.............................................................................................................85139.6. Functional Description..............................................................................................................85339.7. Register Summary....................................................................................................................86839.8. Register Description.................................................................................................................869

40. SDADC Sigma-Delta Analog-to-Digital Converter..............................................88840.1. Overview.................................................................................................................................. 88840.2. Features................................................................................................................................... 888

SAM C21 Family


40.3. Block Diagram..........................................................................................................................88940.4. Signal Description.................................................................................................................... 88940.5. Product Dependencies.............................................................................................................89040.6. Functional Description..............................................................................................................89140.7. Register Summary....................................................................................................................89940.8. Register Description.................................................................................................................900

41. AC Analog Comparators.....................................................................................91741.1. Overview.................................................................................................................................. 91741.2. Features................................................................................................................................... 91741.3. Block Diagram..........................................................................................................................91841.4. Signal Description.................................................................................................................... 91941.5. Product Dependencies.............................................................................................................91941.6. Functional Description..............................................................................................................92141.7. Register Summary....................................................................................................................93041.8. Register Description.................................................................................................................930

42. DAC Digital-to-Analog Converter........................................................................94342.1. Overview.................................................................................................................................. 94342.2. Features................................................................................................................................... 94342.3. Block Diagram..........................................................................................................................94342.4. Signal Description.................................................................................................................... 94342.5. Product Dependencies.............................................................................................................94342.6. Functional Description..............................................................................................................94542.7. Register Summary....................................................................................................................95042.8. Register Description.................................................................................................................950

43. PTC - Peripheral Touch Controller.........................................................................95943.1. Overview.................................................................................................................................. 95943.2. Features................................................................................................................................... 95943.3. Block Diagram..........................................................................................................................96043.4. Signal Description.................................................................................................................... 96043.5. Product Dependencies.............................................................................................................96043.6. Functional Description..............................................................................................................962

44. TSENS Temperature Sensor..............................................................................96344.1. Overview.................................................................................................................................. 96344.2. Features................................................................................................................................... 96344.3. Block Diagram..........................................................................................................................96344.4. Signal Description.................................................................................................................... 96344.5. Product Dependencies.............................................................................................................96444.6. Functional Description..............................................................................................................96544.7. Register Summary....................................................................................................................96944.8. Register Description.................................................................................................................969

45. FREQM Frequency Meter.................................................................................. 98345.1. Overview.................................................................................................................................. 98345.2. Features................................................................................................................................... 98345.3. Block Diagram..........................................................................................................................983

SAM C21 Family


45.4. Signal Description.................................................................................................................... 98345.5. Product Dependencies.............................................................................................................98345.6. Functional Description..............................................................................................................98545.7. Register Summary....................................................................................................................98845.8. Register Description.................................................................................................................988

46. Electrical Characteristics 85C (SAM C21J/G/E).................................................. 99446.1. Disclaimer.................................................................................................................................99446.2. Absolute Maximum Ratings......................................................................................................99446.3. General Operating Ratings.......................................................................................................99446.4. Injection Current.......................................................................................................................99546.5. Supply Characteristics..............................................................................................................99646.6. Maximum Clock Frequencies...................................................................................................99646.7. Power Consumption.................................................................................................................99846.8. Wake-Up Time..........................................................................................................................99946.9. I/O Pin Characteristics............................................................................................................100046.10. Analog Characteristics........................................................................................................... 100146.11. NVM Characteristics...............................................................................................................101646.12. Oscillator Characteristics....................................................................................................... 101746.13. Timing Characteristics............................................................................................................1023

47. Electrical Characteristics 105C (SAM C21J/G/E).............................................. 102747.1. Disclaimer...............................................................................................................................102747.2. General Operating Ratings.....................................................................................................102747.3. Power Consumption...............................................................................................................102747.4. Analog Characteristics........................................................................................................... 102847.5. NVM Characteristics...............................................................................................................103047.6. Oscillator Characteristics........................................................................................................1031

48. Electrical Characteristics 105C (SAM C21N).....................................................103448.1. Disclaimer...............................................................................................................................103448.2. General Operating Ratings.....................................................................................................103448.3. Power Consumption...............................................................................................................103448.4. Analog Characteristics........................................................................................................... 103548.5. NVM Characteristics...............................................................................................................104548.6. Oscillator Characteristics........................................................................................................1046

49. Packaging Information.........................................................................................105049.1. Thermal Considerations......................................................................................................... 105049.2. Package Drawings................................................................................................................. 105149.3. Soldering Profile.....................................................................................................................1061

50. Schematic Checklist............................................................................................ 106250.1. Introduction.............................................................................................................................106250.2. Operation in Noisy Environment.............................................................................................106250.3. Power Supply......................................................................................................................... 106250.4. External Analog Reference Connections............................................................................... 106450.5. External Reset Circuit.............................................................................................................106650.6. Unused or Unconnected Pins.................................................................................................1067

SAM C21 Family


50.7. Clocks and Crystal Oscillators................................................................................................106750.8. Programming and Debug Ports..............................................................................................1070

51. Errata...................................................................................................................107451.1. SAM C21E/G/J.......................................................................................................................107451.2. SAM C21N..............................................................................................................................1100

52. Revision History...................................................................................................110652.1. Rev L - 03/2017...................................................................................................................... 110652.2. Rev K - 11/2016......................................................................................................................110752.3. Rev J - 10/2016...................................................................................................................... 110752.4. Rev I - 09/2016....................................................................................................................... 110752.5. Rev H - 05/2016..................................................................................................................... 110952.6. Rev G - 04/2015..................................................................................................................... 110952.7. Rev F - 02/2015...................................................................................................................... 111152.8. Rev E - 12/2015......................................................................................................................111252.9. Rev D - 09/2015......................................................................................................................111352.10. Rev C - 09/2015..................................................................................................................... 111352.11. Rev B - 06/2015......................................................................................................................111352.12. Rev A - 04/2015......................................................................................................................1113

The Microchip Web Site.............................................................................................1114

Customer Change Notification Service...................................................................... 1114

Customer Support......................................................................................................1114

Product Identification System.................................................................................... 1115

Microchip Devices Code Protection Feature..............................................................1115

Legal Notice............................................................................................................... 1116

Trademarks................................................................................................................1116

Quality Management System Certified by DNV......................................................... 1116

Worldwide Sales and Service.................................................................................... 1118

SAM C21 Family


1. DescriptionThe SAM C21 devices provide the following features: In-system programmable Flash, twelve-channeldirect memory access (DMA) controller, twelve-channel Event System, programmable interrupt controller,up to 84 programmable I/O pins, 32-bit real-time clock and calendar, up to eight 16-bit Timer/Counters(TC) and three Timer/Counters for Control (TCC), where each TC can be configured to perform frequencyand waveform generation, accurate program execution timing or input capture with time and frequencymeasurement of digital signals. The TCs can operate in 8- or 16-bit mode, selected TCs can be cascadedto form a 32-bit TC, and three timer/counters have extended functions optimized for motor, lighting andother control applications. Two TCC can operate in 24-bit mode, and the third TCC can operate in 16- bitmode. The series provide two Controller Area Network (CAN) modules supported CAN 2.0A/B and CAN-FD 1.0; up to eight Serial Communication Modules (SERCOM) that each can be configured to act as anUSART, UART, SPI, I2C up to 3.4MHz, SMBus,PMBus, RS-485 and LIN master/slave; two 12-bit, 1MspsADCs with up to 12-channels each (20 unique channels total), one 24-bit, 3-channels,1.5Msps Sigma-Delta ADC , one 10-bit 300ksps DAC, four analog comparators with window mode, Peripheral TouchController supporting up to 256 channels for buttons, sliders, wheels and proximity sensing;programmable Watchdog Timer, brown-out detector and power-on reset and two-pin Serial Wire Debug(SWD) program and debug interface.

All devices have accurate and low-power external and internal oscillators. All oscillators can be used as asource for the system clock. Different clock domains can be independently configured to run at differentfrequencies, enabling power saving by running each peripheral at its optimal clock frequency, and thusmaintaining a high CPU frequency while reducing power consumption.

The SAM C21 devices have two software-selectable sleep modes, idle and standby. In idle mode theCPU is stopped while all other functions can be kept running. In standby all clocks and functions arestopped expect those selected to continue running. In this mode all RAMs and logic contents areretained. The device supports SleepWalking. This feature allows the peripheral to wake up from sleepbased on predefined conditions, and thus allows some internal operation like DMA transfer and/or theCPU to wake up only when needed, e.g. when a threshold is crossed or a result is ready. The EventSystem supports synchronous and asynchronous events, allowing peripherals to receive, react to andsend events even in standby mode.

The Flash program memory can be reprogrammed in-system through the SWD interface. The sameinterface can be used for non-intrusive on-chip debug of application code. A boot loader running in thedevice can use any communication interface to download and upgrade the application program in theFlash memory.

The SAM C21 devices are supported with a full suite of program and system development tools, includingC compilers, macro assemblers, program debugger/simulators, programmers and evaluation kits.

SAM C21 Family


2. Configuration SummarySAM C21N SAM C21J SAM C21G SAM C21E

Pins 100 64 (56 for WLCSP) 48 32

General Purpose I/O-pins(GPIOs)

84 52 38 26

Flash 256/128KB 256/128/64/32KB 256/128/61/32KB 256/128/64/32KB

Flash RWW section 8/4KB 8/4/2/1KB 8/4/2/1KB 8/4/2/1KB

System SRAM 32/16KB 32/16/8/4KB 32/16/8/4KB 32/16/8/4KB

Timer Counter (TC) instances 8 5 5 5

Waveform output channelsper TC instance

2 2 2 2

TC Maximum and MinimumCapture

Yes No No No

Timer Counter for Control(TCC) instances

3 3 3 3

Waveform output channelsper TCC

8/4/2 8/4/2 8/4/2 6/4/2

DMA channels 12 12 12 12

CAN interface 2 2 2 1

Configurable Custom Logic(CCL) (LUTs)

4 4 4 4

Serial CommunicationInterface (SERCOM)instances

8 6 6 4

Divide and Square RootAccelerator (DIVAS)

Yes Yes Yes Yes

Analog-to-Digital Converter(ADC) channels

20 20 14 10

Sigma-Delta Analog-to-DigitalConverter (SDADC) channels

3 3 2 1

Analog Comparators (AC) 4 4 4 3

Digital-to-Analog Converter(DAC) channels

1 1 1 1

Real-Time Counter (RTC) Yes Yes Yes Yes

RTC alarms 1 1 1 1

RTC compare values One 32-bit value or One 32-bit value or One 32-bit value or One 32-bit value or

SAM C21 Family


SAM C21N SAM C21J SAM C21G SAM C21E

two 16-bit values two 16-bit values two 16-bit values two 16-bit values

External Interrupt lines 16 with HWdebouncing

16 16 16

Peripheral Touch Controller(PTC)

Number of self-capacitancechannels (Y-lines)

32 32 22 16

Peripheral Touch Controller(PTC)

Number of mutual-capacitance channels (X x Ylines)

256 (16x16) 256 (16x16) 121 (11x11) 64 (8x8)

Frequency Meter (FREQM)reference clock divider

Yes Yes Yes Yes

Maximum CPU frequency 48MHz

Packages TQFP QFN

TQFP

WLCSP

QFN

TQFP

QFN

TQFP

Oscillators 32.768kHz crystal oscillator (XOSC32K)

0.4-32MHz crystal oscillator (XOSC)

32.768kHz internal oscillator (OSC32K)

32KHz ultra-low-power internal oscillator (OSCULP32K)

48MHz high-accuracy internal oscillator (OSC48M)

96MHz Fractional Digital Phased Locked Loop (FDPLL96M)

Event System channels 12 12 12 12

SW Debug Interface Yes Yes Yes Yes

Watchdog Timer (WDT) Yes Yes Yes Yes

Related LinksI/O Multiplexing and Considerations

SAM C21 Family


3. Ordering Information SAMC 21 N 18 A - M U T

Product Family

E = 32 PinsG = 48 PinsJ = 64 PinsN = 100 Pins

No character = Tray (Default) T = Tape and Reel

U = -40 - 85OC Matte Sn PlatingN = -40 - 105OC Matte Sn Plating

A = TQFPM = QFNU = WLCSP

21 = Cortex M0+ CPU, DMA, CAN, 16-bit SDADC

SAMC = 5V Microcontroller

Product Series

Flash Memory Density

Device VariantA = Default Variant

Pin Count

Package Carrier

Package Grade

Package Type

18 = 256KB17 = 128KB16 = 64KB15 = 32KB

3.1 SAM C21ETable 3-1.SAM C21E15A Ordering Codes

Ordering Code FLASH(bytes)

SRAM(bytes)

Package Carrier Type Temp

ATSAMC21E15A-AUT 32K 4K TQFP32 Tape & Reel 85C

ATSAMC21E15A-ANT 32K 4K TQFP32 Tape & Reel 105C

ATSAMC21E15A-MUT 32K 4K QFN32 Tape & Reel 85C

ATSAMC21E15A-MNT 32K 4K QFN32 Tape & Reel 105C

Table 3-2.SAM C21E16A Ordering Codes


SRAM(bytes)






SAM C21 Family




SRAM(bytes)








SRAM(bytes)






3.2 SAM C21GTable 3-5.SAM C21G15A Ordering Codes


SRAM(bytes)


ATSAM C21G15A-AUT 32K 4K TQFP48 Tape & Reel 85C

ATSAM C21G15A-ANT 32K 4K TQFP48 Tape & Reel 105C

ATSAM C21G15A-MUT 32K 4K QFN48 Tape & Reel 85C

ATSAM C21G15A-MNT 32K 4K QFN48 Tape & Reel 105C

Table 3-6.SAM C21G16A Ordering Codes


SRAM(bytes)


ATSAMC21G16A-AUT 64K 8K TQFP48 Tape & Reel 85C

ATSAMC21G16A-ANT 64K 8K TQFP48 Tape & Reel 105C

ATSAMC21G16A-MUT 64K 8K QFN48 Tape & Reel 85C

ATSAMC21G16A-MNT 64K 8K QFN48 Tape & Reel 105C

SAM C21 Family




SRAM(bytes)








SRAM(bytes)






3.3 SAM C21JTable 3-9.SAM C21J15A Ordering Codes


SRAM(bytes)


ATSAMC21J15A-AUT 32K 4K TQFP64 Tape & Reel 85C

ATSAMC21J15A-ANT 32K 4K TQFP64 Tape & Reel 105C

ATSAMC21J15A-MUT 32K 4K QFN64 Tape & Reel 85C

ATSAMC21J15A-MNT 32K 4K QFN64 Tape & Reel 105C

Table 3-10.SAM C21J16A Ordering Codes


SRAM(bytes)






SAM C21 Family




SRAM(bytes)






ATSAMC21J17A-UUT(1) 128K 16K WLCSP56 Tape &Reel 85C

1. Contact your local Microchip sales representative for availability.



SRAM(bytes)






ATSAMC21J18A-UUT(1) 256K 32K WLCSP56 Tape & Reel 85C

1. Contact your local Microchip sales representative for availability.

3.4 SAM C21NTable 3-13.SAM C21N17A Ordering Codes


SRAM(bytes)


ATSAMC21N17A-ANT 128K 16K TQFP100 Tape & Reel 105C

Table 3-14.SAM C21N18A Ordering Codes


SRAM(bytes)


ATSAMC21N18A-ANT 256K 32K TQFP100 Tape & Reel 105C

3.5 Device IdentificationThe DSU - Device Service Unit peripheral provides the Device Selection bits in the Device Identificationregister (DID.DEVSEL) in order to identify the device by software. The SAM C21 variants have a resetvalue of DID=0x1101drxx, with the LSB identifying the die number ('d'), the die revision ('r') and the deviceselection ('xx').

SAM C21 Family


Table 3-15.SAM C21 Device Identification Values

DEVSEL (DID[7:0]) Device

0x00 SAM C21J18A

0x01 SAM C21J17A

0x02 SAM C21J16A

0x03 SAM C21J15A

0x04 Reserved

0x05 SAM C21G18A

0x06 SAM C21G17A

0x07 SAM C21G16A

0x08 SAM C21G15A

0x09 Reserved

0x0A SAM C21E18A

0x0B SAM C21E17A

0x0C SAM C21E16A

0x0D SAM C21E15A

0x0E - 0x1F Reserved

0x20 SAM C21N18A

0x21 SAM C21N17A

0x22-0xFF Reserved

Note: The device variant (last letter of the ordering number) is independent of the die revision(DSU.DID.REVISION): The device variant denotes functional differences, whereas the die revision marksevolution of the die.

Related LinksDSU - Device Service UnitDID

SAM C21 Family


4. Block DiagramFigure 4-1.System Block Diagram for SAM C21N

6 x SERCOM

8 x Timer Counter

AHB-APB BRIDGE C

M

MHIGH SPEED BUS MATRIX

POR

T

PO

RT

SERIAL WIRESWDIO

S

CORTEX-M0+ PROCESSOR Fmax 48 MHz

SWCLK

DEVICE SERVICE

UNIT

AHB-APB BRIDGE A

2x 12-CHANNEL 12-bit ADC 1MSPS

AIN[11..0]

VREFA

AIN[7..0]

S

SRAM CONTROLLER

32/16KB RAM

M

5x TIMER / COUNTER

EVE

NT

SYST

EM

S

6x SERCOM

4 ANALOG COMPARATORS

X[15..0]

Y[15..0]

PERIPHERAL TOUCH

CONTROLLER

AHB-APB BRIDGE B

VREFA

VOUT

10-bit DAC

PERIPHERAL ACCESS CONTROLLER

S

PAD0

WO1

PAD1PAD2PAD3

WO0

256/128KB RWW NVMNVM

CONTROLLERCache

M

DMA

2x CAN

3x TIMER / COUNTERFOR CONTROL

WOn

IOBUS

DMA

DMA

DMA

DMA

DMA

MIC

RO

TRAC

E BU

FFER

S

WO0WO1

TxD

RxD

3-CHANNEL 16-bit SDADC 3KSPS

AIN[5..0]

VREFB

DMA

REAL TIME COUNTER

WATCHDOG TIMER

RESETN

OSCILLATORS CONTROLLER

XOUT XIN

XOUT32 XIN32

OSCULP32K

OSC32K

OSC48M

XOSC32K

XOSC

EXTERNAL INTERRUPT CONTROLLER

MAIN CLOCKS CONTROLLER

EXTINT[15..0] NMI

GCLK_IO[7..0]

FDPLL96M

GENERIC CLOCKCONTROLLER

POWER MANAGER

RESET CONTROLLER

OSC32K CONTROLLER

SUPPLY CONTROLLER

VREFBOD55

VREG

DivideAccellerator S

DMA

TEMPERATURE SENSOR

FREQUENCY METER

6 x SERCOM

3x TIMER / COUNTER

2x SERCOMPAD0

WO1

PAD1PAD2PAD3

WO0

DMA

DMA

AHB-APB BRIDGE D

S

3.3V VREG

SAM C21 Family


Figure 4-2.System Block Diagram for SAM C21E/G/J

6 x SERCOM

8 x Timer Counter

AHB-APB BRIDGE C

M

MHIGH SPEED BUS MATRIX

POR

T

PO

RT

SERIAL WIRESWDIO

S

CORTEX-M0+ PROCESSOR Fmax 48 MHz

SWCLK

DEVICE SERVICE

UNIT

AHB-APB BRIDGE A

2x 12-CHANNEL 12-bit ADC 1MSPS

AIN[11..0]

VREFA

AIN[7..0]

S

SRAM CONTROLLER

32/16/8/4KB RAM

M

5 x TIMER / COUNTER

EVE

NT

SYST

EM

S

6x SERCOM

4ANALOG COMPARATORS

X[15..0]

Y[15..0]

PERIPHERAL TOUCH

CONTROLLER

AHB-APB BRIDGE B

VREFA

VOUT

10-bit DAC

PERIPHERAL ACCESS CONTROLLER

S

PAD0

WO1

PAD1PAD2PAD3

WO0

256/128/64/32KB 8KB RWW

NVMNVM

CONTROLLERCache

M

DMA

2x CAN

3x TIMER / COUNTERFOR CONTROL

WOn

IOBUS

DMA

DMA

DMA

DMA

DMA

MIC

RO

TRAC

E BU

FFER

S

WO0WO1

(2)

TxD

RxD

3-CHANNEL 16-bit SDADC 3KSPS

AIN[5..0]

VREFB

DMA

REAL TIME COUNTER

WATCHDOG TIMER

RESETN

OSCILLATORS CONTROLLER

XOUT XIN

XOUT32 XIN32

OSCULP32K

OSC32K

OSC48M

XOSC32K

XOSC

EXTERNAL INTERRUPT CONTROLLER

MAIN CLOCKS CONTROLLER

EXTINT[15..0] NMI

GCLK_IO[7..0]

FDPLL96M

GENERIC CLOCKCONTROLLER

POWER MANAGER

RESET CONTROLLER

OSC32K CONTROLLER

SUPPLY CONTROLLER

VREFBOD55

VREG

DivideAccellerator S

DMA

TEMPERATURE SENSOR

FREQUENCY METER

SAM C21 Family


Note:1. Some products have different number of SERCOM instances, Timer/Counter instances, PTC

signals and ADC signals.2. The three TCC instances have different configurations, including the number of Waveform Output

(WO) lines.

Related LinksTCC ConfigurationsMultiplexed Signals

SAM C21 Family


5. Pinout

5.1 SAM C21E

5.1.1 QFN32 / TQFP32

PA00 1PA01 2PA02 3PA03 4PA04 5PA05 6PA06 7PA07 8

VDD

ANA

9G

ND

10PA

0811

PA09

12PA

1013

PA11

14PA

1415

PA15

16PA2524PA2423PA2322PA2221PA1920PA1819PA1718PA1617

PA27

25R

ESET

N26

PA28

27G

ND

28VD

DC

OR

E29

VDD

IN30

PA30

31PA

3132

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLYREGULATED OUTPUT SUPPLYRESET PIN

SAM C21 Family


5.2 SAM C21G

5.2.1 QFN48 / TQFP48

PA21

PA00 1PA01 2PA02 3PA03 4

GNDANA 5VDDANA 6

PB08 7PB09 8PA04 9PA05 10PA06 11PA07 12

PA08

13PA

0914

PA10

15PA

1116

VDD

IO17

GN

D18

PB10

19PB

1120

PA12

21PA

1322

PA14

23PA

1524

VDDIO36GND35PA2534PA2433PA2332PA2231

30PA2029PA1928PA1827PA1726PA1625

PB22

37PB

2338

PA27

39R

ESET

N40

PA28

41G

ND

42VD

DC

OR

E43

VDD

IN44

PA30

45PA

3146

PB02

47PB

0348


SAM C21 Family


5.3 SAM C21J

5.3.1 QFN64 / TQFP64

PA00 1PA01 2PA02 3PA03 4PB04 5PB05 6

GNDANA 7VDDANA 8

PB06 9PB07 10PB08 11PB09 12PA04 13PA05 14PA06 15PA07 16

PA08

17PA

0918

PA10

19PA

1120

VDD

IO21

GN

D22

PB10

23PB

11

24

PB12

25PB

1326

PB14

27PB

1528

PA12

29PA

1330

PA14

31PA

1532

VDDIO48GND47PA2546PA2445PA2344PA2243PA2142PA2041PB1740PB1639PA1938PA1837PA1736PA1635VDDIO34GND33

PB22

49PB

2350

PA27

51R

ESET

N52

PA28

53G

ND

54VD

DC

OR

E55

VDD

IN56

PA30

57PA

3158

PB30

59PB

3160

PB00

61PB

0162

PB02

63PB

0364

DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLY REGULATED OUTPUT SUPPLYRESET PIN

SAM C21 Family


5.3.2 WLCSP56

1

2

3

4

5

6

7

A B C D E F G H

PA00

PA01

PA03

PB08

PB09

PA04

PA06

PB01

PB02

PA02

PA09

PA05

PA07

PA08

PA31

PB00

PB03

VDDANA

VDDIO

PA10

PA11

PA30

VDDIN

GNDANA

GND

PB12

PB11

PB10

VDDCORE

GND

VDDIO

GND

PB15

PB14

PB13

RESET_N

PA28

PA23

VDDIO

GND

PA13

PA12

PB23

PA27

PA24

PA20

PA18

PA14

PA15

PB22

PA25

PA22

PA21

PA19

PA17

PA16


SAM C21 Family


5.4 SAM C21N

5.4.1 TQFP100

1

2

3

4

44434241403938

5

6

7

8

9

10

11

3332313029282726

25

24

23

37363534

12

13

14

15

16

17

18

19

20

21

22

45 46 47 48

64

63

62

61

60

59

58

57

56

55

54

53

52

51

5049

70

69

68

67

66

65

74

73

72

71

75

100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76

RES

ETN

VDD

IN

GN

D

PA28

VDD

IO

GND

VDDANA

PB01

PB00

PB03

PB02

PB30

PB31

PC05

PA07

PA06

PA04

PA05

PB08

PB09

PA12

PA13

PA14

PA15

PC08

PC09

PC12

PC13

PC10

PC11

PB25

PB24

PC07

PB23

PB22

PA01

PA00

PC26

PC24

PC25

PC06

PC27

PA31

PA30

VDD

CO

RE

PA27

PA08

PA09

PA10

PA11

PA16

PA17

PA18

PA19

VDDIO

PA24

PA25

PA21

PA22

PA20

PA23

PB18

PB19

PB16

PB17

PC21

PC20

PC18

PC19

PC17

PC16

PC14

PB12

PB11

PB10

PC15

PB15

PB13

PB14

GN

DVD

DIO

VDDIO

GND

PB05

PB04

PA02

PA03

PB07

PB06

PC02

PC03

PC01

PC00

GND

VDDIO

PC28

GN

D

PB20

GN

D

PB21


SAM C21 Family


6. Signal Descriptions ListThe following table gives details on signal names classified by peripheral.

Table 6-1.Signal Descriptions List

Signal Name Function Type Active Level

Analog Comparators - AC

AIN[7:0] AC Analog Inputs Analog

CMP[2:0] AC Comparator Outputs Digital

Analog Digital Converter - ADCx

AIN[19:0] ADC Analog Inputs Analog

VREFA ADC Voltage External Reference A Analog

Digital Analog Converter - DAC

VOUT[1:0] DAC Voltage output Analog

VREFA DAC Voltage External Reference Analog

Sigma-Delta Analog Digital Converter - SDADC

INN[2:0] SDADC Analog Negative Inputs Analog

INP[2:0] SDADC Analog Positive Inputs Analog

VREFB SDADC Voltage External Reference B Analog

External Interrupt Controller - EIC

EXTINT[15:0] External Interrupts inputs Digital

NMI External Non-Maskable Interrupt input Digital

Generic Clock Generator - GCLK

GCLK_IO[7:0] Generic Clock (source clock inputs or generic clockgenerator output)

Digital

Custom Control Logic - CCL

IN[11:0] Logic Inputs Digital

OUT[3:0] Logic Outputs Digital

Power Manager - PM

RESETN Reset input Digital Low

Serial Communication Interface - SERCOMx

PAD[3:0] SERCOM Inputs/Outputs Pads Digital

Oscillators Control - OSCCTRL

XIN Crystal or external clock Input Analog/Digital

XOUT Crystal Output Analog

32KHz Oscillators Control - OSC32KCTRL

XIN32 32KHz Crystal or external clock Input Analog/Digital

XOUT32 32KHz Crystal Output Analog

Timer Counter - TCx

WO[1:0] Waveform Outputs Digital

SAM C21 Family


Signal Name Function Type Active Level

Timer Counter - TCCx

WO[1:0] Waveform Outputs Digital

Peripheral Touch Controller - PTC

X[15:0] PTC Input Analog

Y[15:0] PTC Input Analog

General Purpose I/O - PORT

PA25 - PA00 Parallel I/O Controller I/O Port A Digital



PB17 - PB00 Parallel I/O Controller I/O Port B Digital




PC03 - PC-00 Parallel I/O Controller I/O Port C Digital

PC21 - PC05 Parallel I/O Controller I/O Port C Digital

PC28 - PC24 Parallel I/O Controller I/O Port C Digital

Controller Area Network - CAN

TX CAN Transmit Line Digital

RX CAN Receive Line Digital

SAM C21 Family


7. I/O Multiplexing and Considerations

7.1 Multiplexed SignalsEach pin is by default controlled by the PORT as a general purpose I/O and alternatively it can beassigned to one of the peripheral functions A, B, C, D, E, F, G, H or I. To enable a peripheral function on apin, the Peripheral Multiplexer Enable bit in the Pin Configuration register corresponding to that pin(PINCFGn.PMUXEN, n = 0-31) in the PORT must be written to one. The selection of peripheral functionA to H is done by writing to the Peripheral Multiplexing Odd and Even bits in the Peripheral Multiplexingregister (PMUXn.PMUXE/O) in the PORT.

Table 7-1.PORT Function Multiplexing for SAM C21NPin I/O Pin Supply A B B(1)(2) C D E F G H I

EIC REF ADC0 ADC1 SDADC AC PTC DAC SERCOM SERCOM-ALT TC TCC COM AC/GCLK CCL

1 PA00 VDDANA EXTINT[0] SERCOM1/PAD[0] TC2/WO[0] CMP[2]

2 PA01 VDDANA EXTINT[1] SERCOM1/PAD[1] TC2/WO[1] CMP[3]

3 PC00 VDDANA EXTINT[8] AIN[8]

4 PC01 V

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