> > 19.6608 MHz is readily available.
> 
> This seems to fit well in the formula of the 18 series, I think

Yes it does, but you can't PLL (ooops, another noun verbalised)
that. If you want to run the 18F at high speed with 0% comms
error, use 9.8304MHz. Times 4 = 39.3216MHz. For 20MHz
devices, no PLL, 19.6608 or 18.432. IOW divisible by 256,
not 10 (as in the case of 20MHz, 10MHz, 4MHz etc)

PS I really dislike that table because it emphasises comms error
rates when it's so easy to attain 0% with better (sensible ?) xtal
selection

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist