> While it's PROBABLY true, I don't think it's completely obvious that the
> maximum bit rate supported by the uart is dependendent ONLY on the
> clockrate of the PIC.  Most stand-alone external uarts have a much
> lower maximum bitrate than would be implied by the limits of current
> chip technology.

To the PIC circuitry it's just another digital output.  There aren't any
special specs for operating in UART mode that I recall.  It should
therefore be able to switch quite easily at the maximum baud rate allowed
by the baud rate generator (assuming only a few CMOS input loads), which
never exceeds Fosc/16 for the 16F87x in question.

Of course many RS-232 driver chips top off just above 115.2Kbuad, and then
there are cable issues, etc, but the question was what the PIC UART could
do.


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