We designed a device which had two PICs that ran off the same crystal. In=20
retrospect, it was a mistake, but not for the reasons you mention. The firs=
t=20
problem was that one of the ICs could be unpowered during normal operation,=
=20
and load down the clock line so the crystal would stop oscillating (we adde=
d=20
a series resistor as a hack to make it work). The second problem was that=20
the clock turned out to be too slow for our purposes, so we had to spend=20
much more time tweaking the code than would have been the case if we had a=
=20
faster crystal.

Vitaliy


--=20
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