Operation on the working register

Jim Kueneman

Am I missing something or is it not possible to do operations just on the working register? For instance I want the two's compliment of what I have in the register:

    not  w
    inc  w
    retiw

It seems I have to use a scratch register to do this:

    mov    SCRATCH, w
    not    SCRATCH
    inc    SCRATCH
    mov    w, SCRATCH
    retiw

Am I missing something?

Thanks,
Jim

Peter Verkaik

You can set a bit in the OPTION register, to make W available at address $01.
You can then use WREG to do file operations on W. While W is available at $01,
RTCC is not, and vice versa.

regards peter

Jim Kueneman

Ah, interesting. Thanks.

Jim