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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
VARA equ B20
VARB equ B21
goto main
main:
btfsc PORTA, 0
incf VARA, 0
btfsc PORTA, 1
goto NEXTVAR
goto main
NEXTVAR:
btfsc PORTA, 0
incf VARB, 0
btfsc PORTA, 1
goto ADDITION
goto NEXTVAR
ADDITION:
movlw 0
addwf VARA, 0
addwf VARB, 0
movwf PORTB
END ; ends the program
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