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start:
init:
clrf PORTA ; make sure port A output latches are low
clrf PORTB ; make sure port B output latches are low
bsf STATUS,RP0 ; select memory bank 1
movlw b'11111111' ; set port A data direction to inputs
movwf TRISA
movlw b'00000000' ; set port B data direction to outputs
movwf TRISB
bcf STATUS,RP0 ; select memory bank 0
bsf INTCON, INT0IE
bsf INTCON, GIE
counter1 EQU B8
goto main
interrupt:
movf B0, W
movwf counter1
goto countdown
countdown:
call wait1000ms
decfsz counter1, F
goto countdown
bcf INTCON, INT0IF
retfie
main:
call readadc0
movf B0, W
movwf PORTB
goto main
END ; ends the program
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