8/20/2019 Tmr1 CCP MODULE

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F:\latest 877a\CCP Module\Capture Module\tmr1_capture.asm

; FIRST USE OF TMR1 IN CCP(CAPTURE)MODE-USE OF CCP1 WITH CCP1

; INTERRUPT

; CLOCK - 20 MHZ CRYSTAL OSCILLATOR

; USED 5 KHZ PULSE AS INPUT (IN SIMULATION) IN CCP1 PIN (PIN NO. 17)

; ---------------------------------------------------------------

; PROGRAMMER-- SYED TASWAR MAHBUB

; DATED-- 30-08-15

; TIMER1 AND CCP1 MODULE- CAPTURE MODE DEMO WITH CCP1 INTERRUPT

;---------------------------------------------------------------

  TITLE : "USE OF TIMER1 AND CCP1 MODULE IN CAPTURE MODE"

  LIST P=16F877A

  #INCLUDE "P16F877A.INC"

  __CONFIG H'3F71'

;SFR SHOWN BELOW NEEDNOT TO BE SHOWN WITH MEMORY ADDRESS AS IT IS

;INCLUDED IN ABOVE MENTIONED .INC FILE BUT SHOWN HERE SO THAT NEW

;PORGRAMMER CAN SEE IN WHICH MEMORY BANKS THESE SFRS ARE LOCATED.

 

STATUS EQU 0X03

PORTB EQU 0X06

INTCON EQU 0X0B

PIR1 EQU 0X0C

TMR1L EQU 0X0E

TMR1H EQU 0X0F

T1CON EQU 0X10

CCPR1L EQU 0X15

CCPR1H EQU 0X16

CCP1CON EQU 0X17

TRISB EQU 0X86 ; IN BANK 1 SO BANK CHANGE IS REQUIRED

TRISC EQU 0X87 ; IN BANK 1 SO BANK CHANGE IS REQUIRED

PIE1 EQU 0X8C ; IN BANK 1 SO BANK CHANGE IS REQUIRED

ADCON1 EQU 0X9F ; IN BANK 1 SO BANK CHANGE IS REQUIRED

;------------------------------------------------------------------

  ORG 0X00

  GOTO  INIT

  ORG 0X04

  GOTO  INTR_SVC

;-------------------------------------------------------------------

INIT

BANKSEL TRISB

  CLRF  TRISB

  CLRF  TRISD

   MOVLW   B'00000110' ; TURN OFF A/D, PORTA=DIGITAL I/O

   MOVWF  ADCON1

BSF  TRISC,2 ;CCP1 PIN INPUT

BANKSEL PORTB

  CLRF  PORTB

  CLRF  PORTD

  BCF  INTCON,7 ; DISABLE GLOBAL INTR

  BCF  INTCON,6 ; DISABLE PERIPHERAL INTR

BANKSEL PIE1

  BCF  PIE1,0 ; DISABLE TMR1 INTR

  BCF  PIE1,2 ; DISABLE CCP1 INTR

  BANKSEL PIR1

  BCF  PIR1,2 ; CLEAR CCP1 INTR FLAG

  CLRF  CCP1CON ; CCP1 MODULE OFF,CLEAR CCP1 PRESCALER

   MOVLW   B'00000000' ; TMR1 PRESCALER AND TMR1 SETUP

   MOVWF  T1CON ; TMR1 OFF

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8/20/2019 Tmr1 CCP MODULE

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F:\latest 877a\CCP Module\Capture Module\tmr1_capture.asm

  CLRF  TMR1H

  CLRF  TMR1L

  CLRF  CCPR1H

  CLRF  CCPR1L

   MOVLW   B'00000101'

   MOVWF  CCP1CON ; CCP1 IN CAPTURE MODE, CCP1 ON

  BSF  INTCON,7

  BSF  INTCON,6

  BANKSEL PIE1

  BSF  PIE1,2 ; ENABLE CCP1 INTR

  BANKSEL T1CON  BSF  T1CON,0 ; TIMER1 ON

  GOTO  $

INTR_SVC

CLRF  TMR1L

  CLRF  TMR1H

  BCF  PIR1,2 ; CLEAR CCP1 INTR FLAG

   MOVF  CCPR1H,W

   MOVWF  PORTD

   MOVF  CCPR1L,W

   MOVWF  PORTB

 

RETFIE

 

END

;--------------------------------------------------------------

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