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?

----- Original Message -----
From: "Bob Barr" <bbarr@CALIFORNIA.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, November 21, 2003 4:54 PM
Subject: Re: [PIC]: Can PIC-pins handle this?


> On Fri, 21 Nov 2003 16:21:39 +0100, Marcel van Lieshout wrote:
>
> >This is how I do it:
> >
> >The C-code:
> >    portD ^= 0x03;
> >
> >The generated assembler:
> >    movlw 3
> >    xorwf H'F83'
> >
> >So, I was already using his samplecode. PortD is never read.
> >
>
> I've lost track of the processor type in question but your statement
> isn't true with respect to the 16 series PICs. (That "F83" address
> indicates that you're not talking about the 16 series. Is that an
> address for the 18 series?)
>
> For 16 series parts:
>
> While the port may never be getting explicitly read with a MOVF
> instruction, it certainly gets read when the XORWF is executed. The
> port is read, its contents are XOR'd with the constant in W and the
> resulting value is written back to the port.
>
>
> Regards, Bob
>
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