ccp con ccs
TRANSCRIPT
MODULO CAPTURA/COMPARACIÓN/PWM
CAPTURA/COMPARACIÓN/PWM (CCP) VISIÓN GENERAL• Captura• Mide la duración de un evento externo usando como entra el pin
• Comparación• Cambia el estado de un pin de salida o genera una interrrupción
cuando una cantidad especifica de tiempo ha pasado.
• Modulación de ancho de pulso (PWM)• Crea una salida de onda cuadrada con una frecuencia y ciclo de
trabajo definidoCCP MODE Recurso usado
Capture Timer 1
Compare Timer 1
PWM Timer 2Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 2
CCP1M<3:0> Bits de selección de Modo del CCP configuran el modulo como una entrada de captura, salida de comparación o PWM
BIT FUNCTION
CCP1 Control Register (CCP1CON) P1M1 P1M0 DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0
REGISTRO DE CONTROL DEL ECCP
Modo PWMxx11
Modo comparador, dispara un evento especial1101
Modo comprador, genera una interrupción en software al coicidir0101
Modo comparador, limpia la salida al coicidirmatch1001
Modo comparación setea la salida al coicidir0001
Modo captura , cada 16 flancos de subida1110
Modo captura, cada 4 flancos de subida0110
Modo captura cada flanco de subida1010
Modo de captura, cada flanco de bajada0010
Sin usar (reservado)1100
modo comparador, togglea la salida al coincidir0100
Sin usar (reservado)1000
Capture/Compare/PWM Apagado (resetea el modulo CCP)0000
CCP Mode SelectedCCPxM0CCPxM1CCPxM2CCPxM3
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 3
DC1B<1:0> PWM duty cycle 2 LSB’s (8 MSB’s located in CCPR1L)
CCP1M<3:0> CCP Mode Select Bits configure the module as Input Capture, Output Compare, or PWM
BIT FUNCTION
CCP1 Control Register (CCP1CON) P1M1 P1M0 DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 4
REGISTRO DE CONTROL DEL CCP
P1M<1:0>These PWM output configuration bits are available for Enhanced CCP (ECCP) modules only. They provide half-bridge or full-bridge output steering control.
DC1B<1:0> PWM duty cycle 2 LSB’s (8 MSB’s located in CCPR1L)
CCP1M<3:0> CCP Mode Select Bits configure the module as Input Capture, Output Compare, or PWM
BIT FUNCTION
CCP1 Control Register (CCP1CON) P1M1 P1M0 DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 5
REGISTRO DE CONTROL DEL CCP
CCPx
CAPTURE MODE
TMR1H TMR1L
CCPRxH CCPRxL
Prescaler÷1, 4, 16
Edge Detectand
Set the CCPInterrupt flag
Single Buffered
Capture every rising or falling edge, or every 4th or 16th rising edge. Store capture time
here
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 6
CAPTURE INITIALIZATION … C;Turn off CCP module CCP1CON = 0x00;;Make sure Timer1 is off TMR1ON = 0;;Clear Timer1 registers TMR1H = 0x00; TMR1L = 0x00;;Disable all interrupts for CCP CCP1IF = 0; CCP1IE = 0;;Set CCP1 pin for input TRISC2 = 1;;Set Capture for every 4th rising edge CCP1CON = b’00000110’;;Start Timer1 incrementing TMR1ON = 1;;Test the interrupt flag for capture while (!CCP1IF);
TMR1H
TMR1ON
CCP1IF
TMR1L
PIR1
0
CCP1CON
T1CON
1
0
CCPR1H
CCPR1L
1
Rising Edge Detected!!
Captured!
CCP1Pin
01111
1st2nd3rd4th
0 0 0 0 0 0 0 011
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
TIMER1 INCREMENTING!!Current Timer1 Value
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 7
YES CCPx
Special Event Trigger
COMPARE MODE
OUTPUTLOGIC
OUTPUTLOGIC
TMR1H TMR1L
COMPARATORDoes TMR1H:TMR1L =
CCPRxH:CCPRxL ??
COMPARATORDoes TMR1H:TMR1L =
CCPRxH:CCPRxL ??
NO
CCPRxH CCPRxL
Set the CCPInterrupt flag
Set or clear the CCP pin or clear Timer1 and start an ADC conversion
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 8
COMPARE INITIALIZATION … C//Turn off the CCP moduleCCP1CON = 0x00;
//Turn off Timer1TMR1ON = 0;
//Clear Timer1 result registersTMR1H = 0x00;TMR1L = 0x00;
//Disable CCP1 interrupt and make sure //its flag is clearCCP1IE = 0;CCP1IF = 0;
//Make CCP1 pin outputTRISC2 = 0;
//Initialize Compare to set output on matchCCP1CON = 0b00001000;
//Load compare value into CCPR1H:CCPR1LCCPR1H = 0b10000000;CCPR1L = 0x00;
//Start Timer1 incrementingTMR1ON = 1;
//Test CCP1IF for Timer1 match with CCPR1xwhile (!CCP1IF)
TMR1H
TMR1ON
CCP1IF
TMR1L
PIR1
0
CCP1CON
T1CON
CCPR1H
CCPR1L
01
1
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
1
111 111 11 1 1 1 1
0 1 1 1 1 1 1 11
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PWM MODE• Generates a Pulse-Width Modulated (PWM) signal on the CCP1 and CCP2 pins
• Duty cycle, period and resolution determined by the following registers
Period RegisterPR2
Timer2 ControlT2CON
Duty Cycle RegisterCCPRxL
CCP Control RegisterCCPxCON
DescriptionRegister
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 10
PWM OPERATION
CCP1 pin
Latch
CCP1 Output Pin
COMPARATOR
COMPARATOR
R
S
8
8
TMR2 is concatenated with 2 bits from FOSC, or 2 bits from Prescaler to create a 10 bit time base
10
10
10
1
Period Start
0 0 0 0 0 0 0 0 0 0TMR2
PR2
0 0 0 0 0 0 1 1
CCPR1H
0 0 0 0 0 0 0 0 0 0
CCPR1L
DC1B1:DC1B0bits in CCP1CON
0 0 0 0 0 0 0 1 1 1
Determines Period
0 0 0 0 0 0 1 0 11 11
TMR2 Reset to 0’s
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 11
PWM OPERATION
CCP1 pin
Latch
CCP1 Output Pin
COMPARATOR
COMPARATOR
DoubleBuffer
R
S
8
8
10
10
10
10
Period Start
0 0 0 0 0 0 0 0 0 0TMR2
PR2
0 0 0 0 0 0 1 1
CCPR1H
0 0 0 0 0 0 0 0 0 0
CCPR1L
DC1B1:DC1B0bits in CCP1CON
0 0 0 0 0 0 0 1 1 1
Determines Duty Cycle
0 0 0 0 0 0 0 1 1 10 0 0 0 0 0 0 1 1 1
0 0 0 0 0 0 1 0 111 111 10
0 0 0 0 0 0 0 1 1 1
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 12
PWM OPERATION
CCP1 pin
Latch
CCP1 Output Pin
COMPARATOR
COMPARATOR
R
S
8
8
10
10
10
Period 1
10
Period Start
0 0 0 0 0 0 0 0 0 0TMR2
PR2
0 0 0 0 0 0 1 1
CCPR1H
0 0 0 0 0 0 0 1 1 1
CCPR1L
DC1B1:DC1B0bits in CCP1CON
0 0 0 0 0 0 0 1 1 10 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 111 11 1 1 1
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 13
PWM OPERATION
CCP1 pin
Latch
CCP1 Output Pin
COMPARATOR
COMPARATOR
DoubleBuffer
R
S
8
8
10
10
10
Period 2
10
Period Start
Period 1
0 0 0 0 0 0 0 0 0 0TMR2
PR2
0 0 0 0 0 0 1 1
CCPR1H
0 0 0 0 0 0 0 1 1 1
CCPR1L
DC1B1:DC1B0bits in CCP1CON
0 0 0 0 0 0 0 1 1 1
Determines Duty Cycle
0 0 0 0 0 0 0 1 1 10 0 0 0 0 0 0 1 1 1
TMR2 Reset to 0’sTMR2 Reset to 0’s
0 0 0 0 0 0 1 01 111 111 1111 11
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PWM INITIALIZATION … C
PR2
10 1 1 1 1 1 1
CCP1CON
0 0 0 0 0
PWM ModeCCP1M <3:0>
duty cycleLSBs
DC1B<1:0>
CCPR1L
10 0 0 1 1 1 1
TMR2
000 0 0000
111
T2CON
1
TMR2ON
0 0 0 0 0 0 0
Prescaler bitsTOUTPS<3:0>
Prescaler bitsT2CKPS<1:0>
0
//Turn off CCP1 pin by making it an inputTRISC2 = 1;
//Turn off Timer2TMR2ON = 0;
//Clear Timer2TMR2 = 0x00;
//Set up Period and Duty CyclePR2 = 0b01111111; //Load a Period ValueCCPR1L = 0b00011111; //Load a Duty Cycle Value
//Configure CCP module for PWM// and LSB’s of Duty Cycle = b’10’CCP1CON = 0b00101100;
//Turn CCP1 pin back on (make it an output)TRISC2 = 0;
//Start the PWM by turning on Timer2//Configure Prescaler and Postscaler to 1:1)T2CON = 0b00000100;
Programación de Microcontroladores usando XC8. 2013 Mk-Pro Mekatronika 15
PULSE WIDTH MODULATION(PWM) LAB
OUTPUT COMPARE LAB