Thanks Bob,

I was hoping that was how it worked, but was starting to wonder.

It's funny, I feel like I have a reasonable understanding of how a Pic works 
...  but when I go to do something specific (that I haven't done before) ... 
all these other doubts pop up.

No substitute for experience I guess.

Anyway, at least my program should have some hope of running now that you 
guys have sorted me out on my main concerns.

Thanks,   Roger




----- Original Message ----- 
From: "Bob Ammerman" <rammerman@verizon.net>


> From: "Roger Weichert" <rweicher@bigpond.net.au>

>> Does adding  '0'  to the program counter cause any problems?
>>
>> Regards,   Roger
>
> No. The program counter is always pointing at the _next_ instruction. 
> Thus,
> adding zero to it is effectively a NOP. Program execution just continues
> with the very next instruction.
>
>    ADDWF    PCL,F        ; add to program counter
>    GOTO    A                   ; we come here if W was zero
>    GOTO    B                   ; and here if W was one
>    ...etc.
>
> NOTE: You must be careful not to span a page boundary ( a multiple of 
> 0x100
> instructions ) with the above construct because only the least significant
> byte of the program counter is affected by the ADDWF instruction.
>
> -- Bob Ammerman


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