In short, NO!

The total load capacitance seen between the crystal terminals should
equal CL for the crystal to oscillate at the desired frequency.

CL=1/(1/(C1)+1/(C2))+Cparasitic

Where Cparasitic is constituted by pin input capacitance and PCB stray
capacitance.  Typically for well-made PCBs you're looking at 6-8 pF of
stray capacitance.

Cheers,
Adam Smith

> -----Original Message-----
> From: adam-request@viratech.com [mailto:adam-request@viratech.com] On
> Behalf Of wouter van ooijen & floortje hanneman
> Sent: Tuesday, June 11, 2002 2:13 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC] - Serial Woes and Crystals
>
> > How does one figure the size of the caps to use with the crystals.
4pf,
> > 10pf ? I find different values in others projects.
> > Is there a formula specific to the freq, or is it an isolation
mechanism
> > where I could dip into my big bag of .01uf's to get the job done
just as
> > well?
>
> In nearly all cases that will do, but the few cases in which it won't
can
> be
> a big pain in the ass. The best guess is to follow the recommendation
of
> the
> crystal manufacturer, especially when this value falls within the
range
> mentioned in Microchip's datasheet.
>
> Wouter
>
> --
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