> Any comments on my thoughts of bit-banging one channel while using the
> UART for the other?

Not really.  Bit banging can be legitimate in some cases.  The trickiest
part is the receiver since the uncertainty of measuring the start bit adds
to the uncertainty of measuring each data bit.  I did a 9600 baud pure
software UART with a 160KHz PIC once.  That works out to between 4 and 5
cycles per bit.  Transmission worked fine, but there was a reasonable
probability of reception error each byte.  4800 baud would have been
reliable, but we got higher overall speed by designing the protocol to
tolerate some reception errors.  If you've got a lot more cycles/bit, you
can use interrupts, CCP module in capture mode, etc.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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