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With useful implemented peripherals, plentiful practical codeexamples and a broad set of additional add-on boards (ADC,DAC, CAN, RTC, RS-485, etc.), MikroElektronika developmentboards make fast and reliable tools that can satisfy the needs ofexperienced engineers and beginners alike.

USB2.0 programmer

with on board

EasyPIC3User’s Manual

EasyPIC3 User’s Manual

M I K R O E L E K T R O N I K A S O F T W A R E A N D H A R D W A R E S O L U T I O N S F O R T H E E M B E D D E D W O R L D

2page

MikroElektronikaDevelopment tools

EasyPIC

USB

3

No part of this manual, including the product and software described in it, may bereproduced, transmitted, transcribed, stored in a retrieval system, or translated intoany language in any form or by any means, except documentation kept buy the pur-chaser for backup purposes, without the express written permission ofMikroElektronika company.

Product warranty or service will not be extended if the product is repaired, modifiedor altered, unless such repair, modification or alteration is authorized in writing byMikroElektronika.

MIKROELEKTRONIKA PROVIDE THIS MANUAL “AS IS” WITHOUT WARRANTYOF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITEDTO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY ORFITNESS FOR A PARTICULAR PUROSE.

IN NO EVENT SHALL MIKROELEKTRONIKA, ITS DIRECTORS, OFFICERS,EMPLOYEES OR DISTRIBUTORS BE LIABLE FOR ANY INDIRECT , SPECIAL,INCIDENTAL, OR CONSEQUENTIAL DAMAGES(INCLUDING DAMAGES FORLOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUP-TION OF BUSINESS AND THE LIKE) EVEN IF MIKROELEKTRONIKA HAS BEENADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANYDEFECT OR ERROR IN THIS MANUAL OR PRODUCT.

SPECIFICATION AND INFORMATION CONTAINED IN THIS MANUAL ARE FUR-NISHED FOR INTERNATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE ATANY TIME WITHOUT NOTICE , AND SHOULD BE CONSTRUED AS A COMMIT-MENT BY MIKROELEKTRONIKA

MikroElektronika assumes no responsibility or liability for any errors or inaccuraciesthat may appear in this manual, including the product and software described in it.

Product and corporate names appearing in this manual may or may not be regis-tered trademarks or copyrights of their respective companies, and are used only foridentification or explanation and to the owners benefit, without intent to infringe.

Second editionNovember 2005



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EasyPIC

USB

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CONNECTING THE SYSTEM page 4

INTRODUCTION page 5

Power Supply page 10On-board USB programmer page 11

Jumpers page 7Switches and their functions page 6

MCU sockets page 8

LEDs page 12Pushbutton Switches page 14

PS/2 keyboard page 24

7-segment displays page 17Graphic LCD page 18LCD 2x16 in 4-bit mode page 19LCD 2x16 in 8-bit mode page 20

A-D Converter input page 26

CONTENTS

DESCRIPTION OF THE DEVELOPMENT SYSTEM page 6

USB Communication page 23

Direct Port Access page 28

RS-232 Communication page 22

DS1820 Digital Thermometer page 25


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MikroElektronikaDevelopment

tools

EasyPIC

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The development system box in basic option contains a development system, CD,USB cable, serial cable and this manual.

The first thing to do is to insert the CD into your PC's CD-ROM drive.

Take the system out of a box. Unpack the USB cable and connect it to the PC.Please use USB ports from the back of the PC, with direct contact to the mother-board.

Connect the USB cable to the EasyPIC3 board.

The PC will start the procedure for installing the USB driver for the on-board USB2.0 programmer. Follow the procedure from the document “ Installing Driver forUSB programmer” and install the USB driver.

Copy the file PICFlash2.exe to the folder of your choice. You can find this file inthe PICFLASH2 folder on the CD.

Run and use PICflash2 as explained in the document ‘PICflash programmer’.

After these 6 steps, your EasyPIC3 is installed and ready for use. You should try toread a program from the chip or to load an example from the examples folder.

CONNECTING THE SYSTEM

Step no.1

Step no.2

Step no.3

Step no.4

Step no.5

Step no.6



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EasyPIC

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The EasyPIC3 development system is a full-featured development board forMicrochip PIC microcontrollers. It has been designed to allow students and engi-neers to easily exercise and explore the capabilities of PIC microcontrollers. Itallows PIC microcontrollers to be interfaced with external circuits and a broad rangeof peripheral devices, allowing the user to concentrate on software development.

Figure 1 illustrates the development board. Each component is marked on asilkscreen. These marks describe connections to the microcontroller, operationmodes, and provide some useful notes. The need for additional schematics is mini-mized as all the information is printed on the board. IN

TR

OD

UC

TIO

N

INTRODUCTION

Figure 1. EasyPIC3 development board


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SW

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EasyPIC

USB

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SWITCHES

The EasyPIC3 development board features a number of peripherial devices. Inorder to enable these devices before programming, you need to check if appropri-ate jumpers or switches have been properly set.

Switches are devices that have two positions - ON and OFF, which have a role toestablish or break a connection between two contacts. The EasyPIC3 developmentsystem has two groups of switches.

The first group, SW1, enable a connection between the microcontroller ports withanalog capabilities (PORTA and PORTE) and external pull-up/down resistors. Thepull up/down resistors should be disconnected from the analog input pins, otherwisethey will affect the input voltage level. When PORTA and PORTE pins are used asdigital inputs/outputs, the appropriate pull-up/down resistors should be enabled.

The upper four switches of SW2 are used to enable LEDs connected to PORTA/E,PORTB, PORTC and PORTD. For example, if switch PORTB is OFF, all PORTBLEDs will be turned off.

The lower four switches of SW2 are used to enable the 7-segment displays. If youdon’t need the 7-segment displays in your project, these switches should be OFF.

Switch is ON

Switch is OFF

1 ON

43

25

87

6

Figure 2.Group of 8 switches

Switch 4 is ON, and otherswitches are OFF



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EasyPIC

USB

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JUM

PE

RS

Jumpers, like switches, can break or establish a connection between two points.Beneath the plastic cover of the jumper is a metal contact, which makes a connec-tion if the jumper is placed between two disconnected pins.

For example JP15 and JP16 are used to connect or disconnect potentiometers toRA2 or RA3 analog inputs. Connection is made when the jumper is placed betweentwo contacts.

More often jumpers are used as a selector between two possible connections usinga three pin connector. As illustrated in Fig. 4, the middle contact can be connectedto the left or right pin, depending on the jumper’s position.

.

Left line is selected

All lines are disconnected

Right line is selected

Jumper is ON

Jumper is OFF

Figure 3.

Figure 4.

Jumper as aswitch

Jumper as amultiplexer

JUMPERS


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MC

U SS

OC

KE

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EasyPIC

USB

3

The EasyPIC3 is delivered with a 40-pin microcontroller. Users can remove this,and fit a different microcontroller in DIP40, DIP28, DIP18, DIP14 or DIP8 pack-ages of an adequate pin-out.

MCU SOCKETS

NOTE: Since all packages have parallel connections, there must not be more thanone microcontroller on the board at a time.

Figure 5.MCU sockets



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EasyPIC

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MC

U SS

OC

KE

TS

DIP

40

RA0

RA1

RA2

RA3

RA4

RA5

RE0

RE1

RE2

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

VDD

VSS

MCLR

VDD

VSS

RA4

RA4RA4

RA4

PortA

DIP28

vccvccvcc

RA4 RA4GP4

(RA4)

DIP18 DIP14

DIP8

1 ON

87

65

43

2

PORTASW2

The microcontroller’s pins are routed to various peripherals as illustrated in Fig.6.All ports have direct connections to Direct Port Access connectors. Such connectorsare typically used for connecting external peripherals to the board or for providinguseful points for connecting digital logic probe.

All ports are connected to LEDs, push-button switches and pull-up/down resistors ,which allow for easy digital pin state monitoring and testing.

Some of the pins are connected to other peripherials such as the DS1820 tempera-ture sensor, RS-232 communication, 7-segment displays, LCD, etc.

System connectionFigure 6.


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PO

WE

R SS

UP

PLY

EasyPIC

USB

3

As a power supply source, users can select either a regulated supply from the USBcable (default) or an external non-regulated power supply.

In case of the USB power supply, the system should be connected to a PC using theUSB programming cable and jumper JP1 should be set in the right-hand position.

In the case of an external power supply, the EasyPIC3 board produces +5V usingan LM7805 voltage regulator. The external power supply can be AC or DC, with avoltage between 9V and 16 V and jumper JP1 should be set in the left-hand posi-tion. In Fig. 7 you can see the USB (left) and power supply (right) connectors.

GND

Vin Vout

VCC

CN2 8-12V (AC/DC)

+

E1470uF

C8100nF

E2470uF

C15100nF

1

2

VCC

D-

D+

GND

5V 5V

USB

FP1

1

2

3

External Power Supply

USB Power Supply

EXT

EXT

USB

USB

REG17805

E3470uF

POWER SUPPLY

JP1 in the left posi-tion: system willtake power fromthe external AC/DCpower adapter.

JP1 in the rightposition: systemwill take powerfrom the USBcable.

USB and power supply connectorsFigure 7.

Figure 8. Power supply select jumper

Figure 9. JP1 is set to USB power supply

JP1



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EasyPIC

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ON

-BBO

AR

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SB

PPR

OG

RA

MM

ER

ON-BOARD USB PROGRAMMER

When using the DIP18, DIP28 and DIP40sockets, (default) jumpers JP2 and JP3should be in the upper position (default) asshown in Fig. 12.

For the DIP8 and DIP14 sockets, thesejumpers should be in the lower position(Fig. 13).

Figure 10.

Figure 11.

Figure 12.

Figure 13.

USB programming connector

JP4 jumperexplanation

JP2 and JP3 forDIP18, DIP28, or DIP40

JP2 and JP3 forDIP8 or DIP14

There is no need for the use ofexternal equipment during pro-gramming as the EasyPIC3 devel-opment system has its own on-board USB programmer. All youneed to do is connect the system toa PC using the USB cable. Then,load your program into the micro-controller via the PICFlash2 pro-gramming software which is sup-plied with the EasyPIC3.

To the right of the USB programmer, there are jumpers JP2, JP3 and JP4.

Default position

RB5 used as PGM RB4 used as PGM

RB3 used as PGM


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LED

s

EasyPIC

USB

3

Light Emitting Diodes (LEDs) are the most commonly used components, usually fordisplaying pin’s digital state. The EasyPIC3 has 32 LEDs that are connected to themicrocontroller’s PORTA/E, PORTB, PORTC and PORTD.

LEDs

Figure 14.

Light Emitting Diodes

Each group of eight LEDs can be enabled or disabled using switch SW2. Connec-tion for PORTA/E is shown in Fig. 15.

A resistor is used in series with the LED to limit the LED's current. In this case theresistor's value is 1K. All eight LEDs from one port are connected to a commonpoint through these resistors, which can then be connected or disconnected toground by the corresponding switch on SW2.



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EasyPIC

USB

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LED

sThe LEDs are enabled when connected to ground and will display the state of thecorresponding microcontroller pin; otherwise the LEDs will always be off, no mat-ter what the port state is as no current can flow through it.

RN5

R-SIL 8/9

1

2

3

4

5

6

7

89

RA0

RA1

RA2

RA3

RA4

RA5

RE0

RE1

1 ON

43

25

87

6

PORTD LED

PORTC LED

PORTB LED

PORTA/E LED

VCC

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

CURRENT FLOW

X18MHz

C622pF

C722pF

Figure 15.LED schematic

PICflashOn-Board USBprogrammer

R1

71

0K

Re

se

t

VCC

C1

41

00

n

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

VCC

X18MHz

C622pF

C722pF


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PU

SH

BU

TT

ON

SS

WIT

CH

ES

EasyPIC

USB

3

The EasyPIC3 has 32 pushbuttonswitches, which can be used to providedigital inputs to the microcontroller'sports. There is also one switch that actsas a RESET. Reset switch schematic isshown in Figure 17.

PUSHBUTTON SWITCHES

Switch connections to PORTA/E,PORTB, PORTC and PORTD areshown in Fig. 19. Jumper JP20determines whether a button presswill bring logical zero or logicalone to the appropriate pin. In theexample shown in Fig. 19, theswitches are connected to +5V.

Figure 18.Pushbutton switches

Figure 16.Reset switch

Figure 17.

Reset switch schematic


In order to detect a switch state, pull-up or pull-down resistors should be used.Which is used depends on how JP20 is set and is illustrated on the next page. Forthe example shown in Fig. 19, pull-down resistors would be required.


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EasyPIC

USB

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PU

SH

BU

TT

ON

SS

WIT

CH

ES

VCC

RA0

RA1

RA2

RA3

RA4

RA5

RE0

RE1

JP20

RB0

RB1

RB2

RB3

RB4

RB5

RB6

RB7

RC0

RC1

RC2

RC3

RC4

RC5

RC6

RC7

RD0

RD1

RD2

RD3

RD4

RD5

RD6

RD7

PORTA/E PORTB PORTC PORTD

VCC

PIC

xx

xx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

+5V while buttonis pressed

0V while buttonis pressed

X18MHz

C622pF

C722pF

Figure 19.Buttons schematic


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PU

SH

BU

TT

ON

SS

WIT

CH

ES

EasyPIC

USB

3

In the case of Fig. 21the pull-down resistorpulls the microcon-troller port pin toground when the buttonis not pressed. A buttonpress causes the portpin to be connected to+5V (JP20 is in theupper position). Thus,only when the button ispressed will the micro-controller sense a logi-cal ONE; otherwise thepin state will always belogical ZERO.

In the case of Fig. 20the pull-up resistorpulls the microcon-troller port pin to +5Vwhen the button is notpressed. A button presscauses the port pin to beconnected to ground(JP20 is in the lowerposition). Thus, onlywhen the button ispressed will the micro-controller sense a logi-cal ZERO; otherwisethe pin state will alwaysbe logical ONE.

RB4

PortBpull-up

0V while pressed

vcc

DIP

40

RA0

RA1

RA2

RA3

RA4

RA5

RE0

RE1

RE2

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

VDD

VSS

MCLR

VDD

VSS

vcc

RB4

PortBpull-down

5V while pressed

vcc

DIP

40

RA0

RA1

RA2

RA3

RA4

RA5

RE0

RE1

RE2

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

VDD

VSS

MCLR

VDD

VSS

vcc

Figure 20.

Figure 21.

Button with pull-up resistor

Button with pull-down resistor



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EasyPIC

USB

3

7-SS

EG

ME

NT

DDIS

PLA

YS

7-SEGMENT DISPLAYS

The EasyPIC3 has four 7-segment displays in multiplex mode. Data lines are con-nected to PORTB, while each display is enabled through the lower four bits ofPORTA.

dp

R10

10K

Q1

e

d

c

dp

b

a

f

g

Q4Q3Q2

10K 10K 10K

R11 R12 R13

VCC

8.8.

a

b

c

d

e

f

g

PORTA ON

PORTB ON

PORTC ON

PORTD ON

DIS1

DIS1 DIS2 DIS3 DIS4

RA0

DIS2RA1

DIS3RA2

DIS4RA3

1 ON

87

65

43

2

SW2

PIC

xx

xx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

R2 - R9

8.8.

1 2 3 4 5

10 9 8 7 6

8.8.

1 2 3 4 5

10 9 8 7 6

8.8.

1 2 3 4 5

10 9 8 7 6

8.8.

1 2 3 4 5

10 9 8 7 6

X18MHz

C622pF

C722pF

Figure 22.

7-segment displays

Figure 23.7-segment displays schematic


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GR

AP

HIC

LLC

D 11

28X

64

EasyPIC

USB

3

In order to enable GLCD,jumper JP17 should be setto the upper position,labeled as GRAPH.

GRAPHIC LCDThe Graphic LCD (GLCD) allows advanced visual messages to be displayed.While a character LCD can display only alphanumeric characters, a GLCD can beused to display messages in the form of drawings and bitmaps. The most common-ly used graphic LCD has a screen resolution of 128x64 pixels. Before a GLCD isconnected, the user needs to set jumper JP17 (Fig. 24) to the upper position. TheGLCD’s contrast can be adjusted using potentiometer P3, which is placed to the leftof the GLCD below jumper JP17.

P35K

Vee

VCC

Vo

ContrastAdjustment

JP17GRAPH.

CHAR.

D0

D1 D2

D3

D4

D5

D6

D7

CS1

CS2

RS

R/W

E

RST

VCC

VCC

VCC

D5

D4

D3

D2

D1

D0E

R/WR

S

LE

D-

Vo

LE

D+

VC

C

Ve

e

GN

D

RS

T

CS

2

D7

CS

1

D6

1 20

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

LCD8 contrastselected

GLCD and LCD8contrast deselected

GLCD contrastselected

X18MHz

C622pF

C722pF

Figure 26.GLCD schematic

Figure 24.

Figure 25.

GLCDselectionjumper

GLCD



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EasyPIC

USB

3

LCD

22X

16 II

N 44

-BBIT

MMO

DEThe standard character LCD is probably the most widely used data visualization

component. Normally, it can display two lines of 16 alphanumeric characters, eachmade up of 5x7 pixels. The character LCD communicates with the microcontrollervia a 4-bit or 8-bit data bus, each requiring the use of a different connector on theEasyPIC3. For 4-bit data bus use, the LCD should be placed in the upper left of theboard above the LEDs. The connection to the microcontroller is shown in Fig. 28where there are only four data lines. It is important that the LCD is only added orremoved from the EasyPIC3 when the power is off.

LCD 2X16 IN 4-BIT MODE

D7

D6

D5

D4

D3

D2

D1

D0E

R/WR

S

VE

E

VC

C

GN

D

P35K

ContrastAdjustment

VCC

1 14

PIC

xx

xx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

VCC

X18MHz

C622pF

C722pF

Figure 27.

Figure 28.

LCD 2x16 in 4-bit modeFo

ur d

ata

lines

LCD 2x16 in 4-bitmode schematic


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The LCD must be placed in the marked position with two free pins to the left andfour free pins to the right (Figure 29). Only add or remove the LCD from theEasyPIC3 when the power is off. Before adding the LCD, set jumper JP17 to thelower position. The LCD's contrast can be adjusted using potentiometer P3 which islocated to the left of the GLCD/LCD connector.

EasyPIC

USB

3

LCD

22X

16 II

N 88

-BBIT

MMO

DE

LCD 2X16 IN 8-BIT MODE

When using a character LCD in 8-bit mode, the connector that is shared with theGLCD should be used. Since this connector has 20 pins and the character LCD hasonly 14 pins, special attention is required when placing the LCD. Otherwise theLCD can be permanently damaged.

Figure 29.

LCD 2x16 in 8-bit mode

View from the back:shows which pinsstays disconnected.

NOTE: Special attention is required when placing the LCD. Otherwise the LCDcan be permanently damaged.



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EasyPIC

USB

3

LCD

22X

16 II

N 88

-BBIT

MMO

DE

E

R/W

RS

D7

D6

D5

D4

D3D0

D2D1

P35K

ContrastAdjustment

VCC

D7

D6

D5

D4

D3

D2

D1

D0E

R/WR

S

VE

E

VC

C

GN

D

1 14

JP17

GRAPH.

CHAR.

VCC

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

LCD8 contrastselected

GLCD and LCD8contrast deselected

GLCD contrastselected

X18MHz

C622pF

C722pF

Figure 30. LCD 8-bit mode schematic

Leave two freepins to the left side

Leave four free pinsto the right side

In order to enable LCD,jumper JP17 should be setto the lower position,labeled as CHAR.


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EasyPIC

USB

3

RS

-2232

CCO

MM

UN

ICA

TIO

N

RS-232 communication enables point-to-point data transfer. It is commonly used indata acquisition applications for the transfer of data between the microcontrollerand a PC. Since the voltage levels of a microcontroller and PC are not directly com-patible with those of RS-232, a level transition buffer such as the MAX232 must be

used. In order to provide a more flexiblesystem, the microcontroller is connected tothe MAX232 through the two jumpers JP5and JP6. Jumper JP5 is used to connect theRx line to RC7, RB2 or RB1. Jumper JP6 isused to connect the Tx line to RC6, RB5 orRB2. Note that JP5 and JP6 must not beconnected to RB2 at the same time.

RS-232 COMMUNICATION

VCC

VCC

1

1

6

6

9

9

5

5

C1+ VCC

V+ GND

C1- T1out

C2+ R1in

C2- R1out

V- T1in

T2out T2in

R2in R2out

MAX232

Serial Cable

Rx

Tx

Rx

Tx

RC6

RB5

RB2

RB2

RC7

RB1E410uF

E310uF

E510uF

E610uF

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

X18MHz

C622pF

C722pF

Figure 31.

Figure 32.

Connectionbetween microcon-troller and a PC

RS232 connector



23page


EasyPIC

USB

3

US

B CC

OM

MU

NIC

AT

ION

A USB communication connector is placed in the upper right corner of theEasyPIC3 between the RS-232 and PS/2 connectors. It is used with specific PICmicrocontrollers that have USB support, such as PIC18F2450 and PIC18F4550.Note that the USB communication connectorcannot be used for programming and that theUSB programming connector cannot be usedfor communication. In order to enable connec-tion between the microcontroller and USB com-munication connector jumpers JP7, JP8 and JP9should be set to the right-hand position. As aresult, the microcontroller’s RC3, RC4 and RC5pins are disconnected from the rest of the sys-tem and connected to the USB communication

connector.

USB COMMUNICATION

RC4-U

RC4

RC5-U

RC5

RC3-U

100n100n

RC3

VCC

JP7

JP8

JP9

RC3-U, RC4-U, RC5-U areavailable to other peripherials

RC3-U, RC4-U , RC5-U areconnected onl to USBy

VCC

VCC

D+ D-

USB

PIC

xx

xx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

X18MHz

C622pF

C722pF

Figure 33.

Figure 34.

USB communicationschematic

USB communication connectorTo enable USB commu-nication all threejumpers have to be setto the right-hand side.


24page



tools

EasyPIC

USB

3

PS

/2 CC

OM

MU

NIC

AT

ION

The PS/2 connector allows direct connectionbetween the EasyPIC3 and devices that usePS/2 communication, such as a PC, keyboardor mouse. For example, the microcontrollercan be connected to a keyboard to read thepressed keys or it can be connected to a PC toact as a keyboard. For data tansfer CLK andDATA lines are used. In this case, they areconnected to pins RC1 and RC0 respectively.

PS/2 COMMUNICATION

DATANCGNDVCCCLKNC

PS2CONNECTOR

+5V

DATANC

NC CLK

VCC

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

VCC

X18MHz

C622pF

C722pF

Figure 37.

Figure 35.

PS/2 connector

PS/2 communication schematic

Figure 36.Keyboard connected to develop-ment board



25page


EasyPIC

USB

3

DS

1820

DDIG

ITA

L TT

HE

RM

OM

ET

ER

The DS1820 digital thermometer is well suited toenvironmental temperature measurement, having atemperature range of -55C to 125C and an accura-cy of +/-0.5C. It must be placed correctly in the 3-pin socket provided on the EasyPIC3, with itsrounded side to the right, as marked on the board(see Fig. 38) otherwise the DS1820 could be per-manently damaged. The DS1820’s data pin can beconnected to either the RA5 or RE2 pin, which isdetermined by jumper JP14.

JP14

DS1820

VCCGND

DQ

PIC

xx

xx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

DQ line isconnected to RE2

DQ line isconnected to RA5

DQ line isconnecteddis

VCC

-50 C

125 C

VCC

X18MHz

C622pF

C722pF

There is a mark inthe form of half-circlefor proper orientationof DS1820 sensor.

DS1820 DIGITAL THERMOMETER

Figure 38.

Figure 39.

DS1820

DS1820 Schematic


26page



tools

EasyPIC

USB

3

AN

ALO

GU

E TT

O DD

IGIT

AL

CCO

NV

ER

TE

R II

NP

UT

A-D CONVERTER INPUT

Figure 40.A-D Converter input

The EasyPIC3 development board have two potentiometers for working withAnalogue to Digital Converter - ADC. Potentiometer P1 is active when jumper JP15is enabled and gives analogue signal to microcontroller’s RA2 pin. Potentiometer P2is active when jumper JP16 is enabled and gives analogue signal to RA3 pin. Bothpotentiometers analogue output is in the range of 0V to 5V as drawn on board.

In order to measure analogue signal without interference, the pull-up/down jumpershould be removed from PORTA. In this way PORTA pins remain floating.

The application of A-D Conversion is various. Microcontroller takes analogue sig-nal from its input pin and translates it into a digital number. Basically, you can meas-ure any analogue signal that fits in range acceptable by PIC. That range is 0V to 5V.



27page


EasyPIC

USB

3

AN

ALO

GU

E TT

O DD

IGIT

AL

CCO

NV

ER

TE

R II

NP

UT

vcc

P210K

P110K

0 - 5V

0 - 5V

0 - 5V

JP15

JP16

PortA

vcc

pull-up/down

1 ON

87

65

43

2

SW1

PIC

xx

xx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

vcc vcc

X18MHz

C622pF

C722pF

Figure 41. A-D Converter input schematic

Pull-up/down resistors onpins RA2 and RA3should be disabled usingSW1

Potentiometers are con-nected to RA2 and RA3pins.

Potentiometers are dis-connected from micro-controller.


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EasyPIC

USB

3

These connectors can be used for system expansion with external boards such asCompact Flash, CAN, RS-485, etc. Ensure that the on-board peripherals are dicon-nected from microcontroller by setting the appropriate jumpers while externalperipherals are using the same pins. The connectors can also be used for attachinglogic probes or other test equipment.

DIR

EC

T PP

OR

T AA

CC

ES

S

All microcontroller input/output pins can be accessed via connectors placed alongthe right-hand side of the board. For each of the PORTA, PORTB, PORTC, PORTDand PORTE, there is one 10-pin connector providing Vdd, GND and up to eight portpins.

DIRECT PORT ACCESS

Figure 42.Direct port access connectors

Figure 43.

Example of how to connectexternal peripheral with flatcable



29page


EasyPIC

USB

3

DIR

EC

T PP

OR

T AA

CC

ES

S

RB4

RB6

RB0

RB2

RB5

RB7

RB1

RB3

HEADER 5x2

CN7

RB6

RB7

RB4

RB5

RB2

RB3

RB0

RB1

8

9

6

7

4

5

2

3

1

2

3

1JP13

Pull-up line isconnected

All linesare disconnected

Pull-down lineis connected

RN2

VCC

PIC

xxxx

RA0

RA1

RA2

RA3

RC0

RC1

RA4

RA5

RE0

RE1

RE2

RC3

RD0

RD1

RC4

RD3

RD2

RC5

RC6

RC7

RD4

RD5

RD6

RD7

RB0

RB1

RB2

RB3

RB4

RB5

RB7

RB6

RC2

VDD

VSS

OSC1

OSC2

MCLR

VDD

VSS

VCC

VCC

X18MHz

C622pF

C722pF

Figure 44.

PORTB connection


30page



tools

EasyPIC

USB

3

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