Thanks, Byron, for the quick response. Now I understand. And I like the
shadow register solution.

on 1/13/02 4:26 PM, Byron A Jeff at byron@CC.GATECH.EDU wrote:

>> Up to the label "prob", the LEDs remain unlit. I would expect them to light
>> after "prob" executes. They don't. However, if I change the 0xFF at "why" to
>> 0x00, then the LEDs are lit (and I can then change the 0x00 at "prob" to
>> 0xFF, and they'll remain lit).
>
> Not sure about this one. The code looks right. There's no RMW issues/
>
> Anyone?

Actually, I solved the other problem. I was being stupid; it was working
correctly. In some other code I was loading the FSR with:

    movfw   gMyBuffer
    movwf   FSR

rather than the correct:

    movlw   gMyBuffer
    movwf   FSR

This was the root of a lot of "weird" behavior, coupled with the fact the my
LEDs were wired to turn on with 0's written to the port, confused me to no
end. When I wrote that those instructions (in my original post) were not
working, they were in fact working, just opposite to what I was expecting.

Thanks again for all the help!

--Rick

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