It seems to be working pretty well now, however when I use the rlf instruction
the data is rolled into the high nibble of the variable temp and the carry never
sees is.  How can I make the temp variable four bits wide?    Thanks for having
mercy on such a newbi.

Scott

Tony Nixon wrote:

> Scott wrote:
> >
> > Tony
> >
> >         I did not expect to get a response so fast, thanks.  However the
> > code that you supplied executed in exactly the same way as my original
> > code.  It seems that when I rrf the a register the first bit is sent to the
> > carry.  When the instruction comes around a second time it again shifts the
> > first bit into the carry instead of the second bit.
> >
>
> Yes, that would be correct because you read PortA again and reloaded
> 'Temp' with this data.
>
> However, if any switches are set, then the appropriate 'code_x' routine
> will have executed before returning to the loop. I guess you have
> appropriate code in these routines to handle debouncing, use switch once
> and discard, or repeat, and to detect when it releases.
>
> It is best to read the port once to get the switch information, rather
> than to use the 'rrf' instruction on it repeatedly.
>
> --
> Best regards
>
> Tony
>
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