>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of alan smith
>Sent: 31 May 2007 15:54
>To: Microcontroller discussion list - Public.
>Subject: RE: [PIC] resonators
>
>
>Thanks for the replies.  Interesting, the resonator with no 
>caps....is oscillating at its rated frequency but maybe it 
>doesnt have enough drive for the PIC.  I hope thats the issue 
>with not running in debug, pretty sure it is since I had a 
>40MHz xtal on it, and it seemed to work, just didnt want to 
>run the part at 40Mhz.  So I'll drop a couple caps on and see 
>what happens.

The maximum clock frequency using a crystla/resonataor in HS mode for the 18F252 is 25MHz.  To run at 40MHz reliably you either need to provide an external clock (e.g. canned oscillator) or use a 10MHz crystal and the internal PLL.

Regards

Mike

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