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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'00000000' ; set port A data direction to inputs
movwf TRISA
movlw b'00001111' ; set port B data direction to outputs
movwf TRISB
bcf STATUS,RP0 ; select memory bank 0
;stackptr EQU B10
tmpdata EQU B9
goto main
main:
;movlw 0
;movwf stackptr
movlw b'00000001'
movwf PORTA
movlw b'10100000' ; move 1111 to the output
movwf PORTB
movlw b'00000000'
movwf PORTA
movlw b'11111111'
movwf TRISB
movf PORTB, W
movwf tmpdata
movlw b'00001111'
movwf TRISB
swapf tmpdata, W
movwf PORTB
noend:
goto noend
END ; ends the program
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