> -----Original Message-----
> From: Herbert Graf [SMTP:mailinglist@FARCITE.NET]
> Sent: Wednesday, June 11, 2003 4:49 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: 3rd Overtone Crystal operation?
>
> > I am trying to run my PIC(18F252) at 40Mhz, which is locked to an
> > external source using a PLL. I has this working with a 10MHz
> > crystal using HS/PLL mode to give 40Mhz, but have had other
> > issues with the HS/PLL so now want to run with HS mode
> >
> > The only 40Mhz crystals that I have been able to get hold of in a
> > hurry have been 3rd Overtone mode ones. I only have a vague idea
> > of what this means!
> >
> > Can anyone tell me how I make it run correctly in the 3rd
> > overtone mode? Or direct me towards some information? I am
> > assuming at the moment that the circuit arrangement needs
> > changing slightly? I've googled and found a little info but not much.
>
>         The only way to get that part running at 40MHz is with a 10MHz
> crystal and
> PLL enabled, max crystal speed is speced at a maximum of 25MHz IIRC. Check
> the datasheet. TTYL
>
The datasheet says you can inject 40MHz into CLKI in EC mode. (at least mine
does).

Regards

Mike


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