Ken Webster wrote:

> Thomas C. Sefranek wrote:
> >>> Does bit 4 being a 0 at power up indicate the buffer is full?
> >>
> >>No, it means that the USART hasn't been turned on yet.
> >>
> >>> If so, who filled it?  (And when will it empty?)
> >>> if not, why is bit 4 a 0?
> >>
> >>TXREG started out empty. Turning on the USART (SPEN) turns
> >>on TXIF so that it will generate an interrupt and get loaded.
> >
> >Well I too believed this until I couldn't get any action from
> >the TX pin PORTC bit 6.  So I looked at the code on the MPLAB,
> >and sure enough EVEN AFTER turning on the SPEN the flag bit
> >is STILL ZERO indicating buffer full!
>
> Are you remembering to also turn on TXSTA:TXEN to enable the USART transmit
> module?
>

Yes, but thanks anyway.

>
> Cheers,
>
> Ken

--
  *
  |  __O    Thomas C. Sefranek   tcs@cmcorp.com
  |_-\<,_   Amateur Radio Operator: WA1RHP
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