Can't get 18F2221 PLL to run with INTOSC

[Darrel Taylor]

Also, try putting the OSCCON statement before the OSCTUNE.

Additionally,
the PLL will only function when the selected output frequency
is either 4 MHz or 8 MHz (OSCCON<6:4> = 111
or 110). If both of these conditions are not met, the PLL
is disabled and the PLLEN bit remains clear (writes are
ignored).

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