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F:\latest 877a\timer0 overflow 1sec delay\1sec_delay_intr.asm ;----------------------------------------------------------------- ; PROCESSING INTERRUPT- 1SECOND DELAY BY TIMER0 OVERFLOW INTERRUPT ;PROGRAMMAR- SYED TASWAR MAHBUB ; MODUS OPARENDY: ; LEDS ARE ON AND OFF ALTERNATELY IN EACH SECOND. ; TMR0 OVERFLOW IS 255X128(PRESCALE)=6.528 MS ; COUNTER INCREASES UPTO 153 TIMES AND TOTAL ; STANDS=
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6.528X153=1SEC(0.998784SEC ACTUALLY). ;------------------------------------------------------------------ TITLE: "1SECOND DELAY BY TIMER0 OVERFLOW INTERRUPT ROUTINE" LIST P =PIC16F877A #INCLUDE "P16F877A.INC" __CONFIG H'3F71' CBLOCK 0X20 CNT ENDC ORG 0X00 GOTO INIT ORG 0X04 GOTO ISR ;--------- MAIN PROGRAM STARTS HERE ------------------------------------- INIT BANKSEL TRISB CLRF TRISB CLRF TRISC CLRF TRISD MOVLW B'10000110' ;PRESCALE VALUE = 128 MOVWF OPTION_REG BANKSEL PORTB CLRF PORTB CLRF PORTC CLRF PORTD START BCF INTCON,2 ;TOIF DISABLE,SO INTR FLAG CAN BE SET WITH INTR. BSF INTCON,5 ;TOIE SET BSF INTCON,7 ;GIE SET CLRF CNT LOOP GOTO LOOP ;PROGRAM COUNTER WILL REMAIN HERE TILL INTERRUPT ISR BCF INTCON,2 ;TOIF DISABLE,SO INTR FLAG CAN BE SET WITH NEXT INTR INCF CNT,F MOVLW .153 SUBWF CNT,W ; WHEN