Hello Mike.

Seems to be skip_if_Zero logic is fault in case of decfsz PCL,f
command in example I was offer to discussion.

WBR Dmitry.

> >What will happen after the following set of commands will be executed ?
> >
> >        org     xx0
> >
> >        decfsz  pcl,f
> >        cmd_1                   ;next cmd
> >        cmd_2                   ;etc.
> >
> I doubt the PIC's skip logic is complex enough to "properly" handle the
> situation of a modify PCL also causing a skip.  The modify PCL would
> trigger a skip (of cmd_1) by itself, then the decfsz instruction would be
> fetched again.  The decfsz instruction will repeatedly execute in an
> infinite loop.
>
> If the logic is designed to skip the re-fetched decfsz instruction, then
> cmd_1 would be executed.  But that's a long shot, such "delayed skip"
> logic would only act in this case so it wouldn't make much sense to build
> it into every PIC.