> Also, the data sheet doesn't say anything about a max 64 MHz clock
> source for the main oscillator.

It doesn't.
But if you read my prior post (after this one of yours that I'm
replying to here) you'll see that it DOES say something about a 40 MHz
limit for the main oscillator.

> It only says that for the axillary
> clock source for peripherals. So I'm guessing I could use an 80 MHz
> crystal oscillator if I wanted.

Are you trolling for a rise from Olin?
Seems to be working :-)

ie reading about what it says about the specific signal of interest
"is wise" [tm].
Find the signal name (here "EC" and also "external clock") and search
the data sheet for numeric values.
About 99.14159265358979% of all data sheets will specify such things.
Some few fail to. This one doesn't (fail to).



        Russell
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