Hi Bob,

>> 2) Is the following set of codes have the same effect on program flow?
>>
>> A1 MOVLW 0x00
>>    ADDWF PCL,f
>>
>> A2 GOTO A2
>
> Because W is zero, the ADDWF PCL,F is effectively a NOP, so this will
> execute the MOVLW, the ADDWF and then repeat the GOTO indefiniitely.

>> B1 MOVLW 0xFF
>>    ....
>>    ADDWF PCL,f

>> B2 GOTO $-1
>
> Because W is 0xFF, adding it to PCL will keep resetting PCL to point to
the
> ADDWF instruction. So, in this case the MOVLW will execute, and then the
> ADDWF will be repeated indefinitely. The GOTO will never be reached.

I have to apology here for not stated clearly my question. Actually I was
giving 4 pieces of codes and I was comparing A1 to A2, B1 to B2.

But I thinks I get the answers from your post anyway.

Thanks a lot.
WH Tan

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