Peter Restall wrote:
> ideally I'd like to use a
> 7.5MHz crystal with OSC1/2 and 16x PLL, but I can't find any place
> that sells that frequency quartz.

If you need enough of a crystal you can get a custom frequency made.  If
not, the standard frequency of 7.3728MHz is widely available since it is a
multiple of common baud rates.  That means you run at 29.49 MIPs instead of
30.00 MIPs, which is only 1.7% less.  You do get the advantage that it can
hit any of the common baud rates exactly.


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