> PIC's are solid state design so it's possible at all frequency's.
> The PLL would need to have a very good loop-filter to handle different
> frequencies, but that's Microchips problem, I'm only going to play with it
> hehe...

The PLL has a limited input frequency range, 4 - 10MHz if I remember
correctly.  Think about it.  It would be very difficult to design a PLL that
worked to an arbitrarily low frequency.


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