ejemplo que viene junto al compilador PBP
hay un cambio de stado en un bit del pueto
puedes ir cambiando la salida en el fuente
y asi comprobar
" Example program from manual to blink an LED connected to PORTB.0 about once a second
loop: High 0 " Turn on LED connected to PORTB.0
Pause 500 " Delay for .5 seconds
Low 0 " Turn off LED connected to PORTB.0
Pause 500 " Delay for .5 seconds
Goto loop " Go back to loop and blink LED forever
End