> I can't get a PIC18F452 to PLL (x4).
> I've used these chips in MANY projects with no problems with PLL,
> but on my latest test board, (which worked for several days) it has 
> dropped out of PLL.
> Yes, I changed the chip, same results.
> Yes, the MPLAB shows the configuration to be HS/PLL.
> Yes, I re-programmed them.
> What am I missing here?

did you power the chip down (and up) after changing the PLL setting?
Most fuses require only a reset to take effect, but not this one.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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