Glad to see it sparked some debate, but just qualifying that the
RS232 bit is only a very small part in my case; I was only going to
use it in the development stage (via PICKIT2) for getting initial
sensor value readings, so I have some sort of idea of what sort of
triggering/filtering functions I need to write, what the various
threshhold points are etc.  No major comms, just say 10secs worth of
data connection.  Repeated over quite a few tests, to make sure the
data is consistent.
 After that, there won't be any comms whatsoever in the "deployed"
version, purely the sound system, and that's sound effects rather than
voice/music.  I guess it won't hurt to just experiment with the OSC
set to internal FRC rather than the external crystal, and see how it
goes.  As it is, I need to re-do the power supply of the PCB anyway; I
took into account the current requirements of the opertion of the
class-D audio amp, but forgot about the power for actual
amplification!
 Thanks
 Lee
 resonator).
 It may be okay if the temperature range is very limited (say, a
in-factory
 configuration port), the other side is known to be accurate (say a
PC),
 and the consequences of failure are minimal. Generally, though,
you're
 safer with a resonator or xtal.
 -- sp
=20
--=20
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