Marcel van Lieshout wrote:

> Yes, the sample was for 18F452.
>
> I understand that the hardware must read the port to being able to execute
> the xor. Would this be a problem?


Yes, depending on how you are loading the pins, the value
that you read, might not be what you wrote last time.

You could do comething like :

  movf    latd, w
  xorlw   x'03'
  movwf   port   (or movwf   latd,   it doesn't matter...)

or

  movlw   3
  xorwf   H'F8C'   (F8C is LATD, F83, as before, is PORTD.)

or (better)

  movlw   3
  xorwf   LATD

Have fun !

Jan-Erik.

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