Matt Bonner wrote:

> It seems that if a TMR0 interrupt occurs when the 16C63 UART
> is transmitting, additional identical characters are sent.
>
> The timer interrupt  is the only one enabled and I am pushing
> and popping the W and FSR registers using the SaveContext
> macro provided with the ByteCraft C compiler.  If I disable
> the TMR0 interrupt, the  communications work fine.
>
> Walter (if you're out there), any ideas?
>
> --Matt
Matt

Sorry I missed your post earlier this week.

I haven't heard about then extra characters from either
the experience at Byte Craft or from conversations we
have had with our customers. Email me privately with details
and I will arrange to duplicate have the problem duplicated at
Byte Craft so we can find out if it is a software or hardware
issue .

The SaveContext routines are critical to save and restore
the system context and any changes should be made with
great care. If you have any questions about these routines
email support@bytecraft.com

Walter Banks