Ian Parish wrote:
> I'm looking for a neat code snippet for word subtract for the 16F84. I've foun
d some info for word add (on Dejanews) but I can't seem to extend this simply to
 subtract.
>
> for word add I've got:-
>
>         MOVF            Word1Low,W
>         ADDWF   Word2Low,F
>         MOVF            Word1High,W
>         BTFSC           STATUS,C
>         INCFSZ          Word1High,W
>         ADDWF   Word2High,F
>
> ... which produces Word2 += Word1, with carry correctly set!
>
> Any ideas?
>
> Also, does anyone have the URL of a searchable acrhive for this list?

Hi,

There is a complete set of 16bit routines in Myke Predko's site and
explaining this routine. Check http://www.myke.com

Reggie