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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
goto main
main:
btfsc PORTA, 0
goto flashled
goto main
flashled:
movlw b'11111111'
movwf PORTB
call wait1000ms
call wait1000ms
movlw b'00000000'
movwf PORTB
call wait1000ms
btfsc PORTA, 0
goto flashled
goto main
END ; ends the program
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