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In: Electrical Engineering

For the PIC16F887, using the execution delay of instructions, write assembly language commands to implement a...

For the PIC16F887, using the execution delay of instructions, write assembly language commands to implement a delay of 3 seconds

Solutions

Expert Solution

LIST p=16F877A

INCLUDE <P16F877A.inc>

X EQU 0x20

Y EQU 0x21

ORG 0x00

BANKSEL TRISD

BCF TRISD,7

BSF TRISD,2

BANKSEL PORTD

state btfss PORTD,2

GOTO main

GOTO ledoff

main

CALL setval

BSF PORTD,7

CALL delay

CALL setval

BCF PORTD,7

CALL delay

btfss PORTD,2

GOTO main

GOTO ledoff

ledoff BCF PORTD,7

GOTO state

delay movlw 0xF9

nop

loop addlw 0xFF

btfss STATUS,Z

goto loop

decfsz X

goto delay

decfsz Y

goto delay

return

setval MOVLW 0xFF

MOVWF X

MOVLW 0x04

MOVWF Y

return

END

delay

movlw 0xF9

nop

loop addlw 0xFF

btfss STATUS,Z

goto loop

decfsz X

goto delay

Manojponduru answered 2 years ago
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