Jan-Erik Soderholm wrote:

> Note that the PLL in these parts are a fixed 4 MHz -> 96 MHz
> PLL. Other (non-USB PIC18) parts can use different input
> frequencies to it's PLL circuit.

You say, Jan-Eirk?

> So 8 MHz xtal and 2/ PLL-prescaler is fine, but probebly not
> a 9.8 MHz xtal, sice it can't be divided down to 4.0 MHz.

I made a 2550 work with a 8.867 (PAL Chroma XTal) and it was fine 
(actually, overclocked a bit :)
I don't think that you need a actual 4MHz, I guess.


-- 
Ciao, Dario
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