> > Hmm.  Then the appropriate xtal would be about 16pF or so.
> > Or bring the caps up to 39pF
>
> Can You explain this a bit more? :)

Despite any microcontroller data sheets to the contrary, the CRYSTAL
determines the cap values.  If a given uC data sheet shows say 22pF
caps, then you're seeing the result of misinformed consumers beating
up the vendor to provide something they shouldn't.  A correctly done
app note will not show cap values unless they also show a specific
crystal part number.  It's up to you, the engineer, to select the
appropriate crystal, and then the proper caps given that crystal, and
your PCB layout.

A given uC may have a preference for crystals of a given impedance and
drive level, but that's a different issue.   The fox application notes
cover this pretty well.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist