Wouter van Ooijen wrote:

>>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?
>
I believe I did, but I'll try it again this morning when I get to work.

>Most fuses require only a reset to take effect, but not this one.
>
Really?  I've not noticed this before.
(And the chip was left working on Friday evening!)

I powered the board down to change some peripheral chips...

I don't think the fuses changed by themselves...
Or at least I hope that is impossible!

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

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