Using PLL with the Internal Oscillator

You have to set OSCCON bits SCS to “00” for the PLL to be able to be used on many PIC18 devices. Do not set to “01”=internal oscillator, instead select the internal oscillator in the CONFIG bits and set it to “00”=primary clock.

If you don’t you’ll never see the OSCCON2 bit PLLRDY get set to confirm the PLL is being used.

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