I have a setup in this manner, and it seems to work ok. My external
oscillator is 10MHz, and I have the PLL engaged, and the chip runs. I
haven't ever actually measured the frequency of operation, but from what
I observe it should be 40MHz.

Josh
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Mike Harrison 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 ?

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