How do you measure the speed? Keep in mind that all the peripherals run
at Fosc (5MHz), only core clock is 20MHz. Do a code that oscillates an
output pin and measure if the frq is different wether you have PLL
enabled or not.

 - K

Graham North wrote:
>
> I am trying to get the PPL working on the 18F8720. I am currently running
> the device at 20MHz @5V using a 20MHz crystal and HS mode.
> I wanted to use a 5MHz crystal and HS PLL mode, but I can't get it to work.
> When I change the config bits, and use a 5MHz crystal it just runs at 5MHz,
> not the expected 20MHz!
>
> Help, I'm tearing my hair out.
>
> I'm using MPLAB 6.13 and an ICD2 if that makes any difference.
>
> Thanks
>
> Graham
>
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