> There ought to be a whole slew of applications where it is valid to
> assume
> that the other side is at least crystal controlled (ie a PC
> or similar)

Yes, but that other side might well have choosen a crystal that was
already present for some other purpose, with  a frequency that intrudces
only a small error, 2% or so, but that does not matter because serial
communications is not guaranteed to fail with less than 6% error.

The trouble with this 'try and see: it works' approach is that it does
not take into account that things can vary wildly from PC to PC, PIC to
PIC, cable to cable, with temperature, with humidity, with the phase of
the moon, etc.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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