At 07:00 PM 2/13/03 +0000, you wrote:
>Looking at the 18Fxx2 datasheet, it says that the PLL can only be used in HS
>crystal mode, but it's
>not clear whether or not you can apply an external clock in HS mode and use
>the PLL - anyone know if
>this is possible ?

A TTL OSC will put out a square wave.  Take a look at the rise-time specs
for the OSC pin in HS mode.  I think you will want to put a resistor in
series there to fix that.  I'd have to look closely, but one to the OSC2
pin might help.

Andy

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