> I am trying to run my PIC(18F252) at 40Mhz, which is locked to an
> external source using a PLL. I has this working with a 10MHz crystal
> using HS/PLL mode to give 40Mhz, but have had other issues with the
> HS/PLL so now want to run with HS mode

HS mode only goes to 20MHz, see manual.  You need the PLL to get 20-40MHz.


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