Indeed- thanks for pointing that out.

Mike H.

On 11/16/05, Spehro Pefhany <speff@interlog.com> wrote:
> At 08:37 AM 11/16/2005 -0600, you wrote:
> > > I'm designing a circuit using a PIC18F452 that is going
> > > to communicate through USART at 115200bps. From
> > >  the pic datasheet, I calculated that the ideal crystal
> > > for my app is 14.7456MHz (or 7.3728MHz, but I'll stick
> > > with the faster because I need the extra speed).
> >
> >I'll take another tack, since you've had a number of
> >excellent answers about this from other folks...
> >
> >Have you considered a three-pin ceramic resonator?
> >Accuracy is sub-crytal (~.5%), but much better than
> >internal oscillator or RC network.  Plus, the three pin
> >jobs have internal caps, so you just plug it in and go.
> >They're also more rugged than crystals.
> >
> >My favorite is 81-CSTCC3.68MG-TC from Mouser.
> >Surface mount.  Run 3.68 into the PLL and you'll
> >get 14.72- sound familiar?
> >
> >Mike H.
>
> Doesn't that violate the maximum HS oscillator period specification of
> 250ns with PLL active? (Parameter 1/1A) Not that I doubt it usually works...
>
> Best regards,
>
> Spehro Pefhany --"it's the network..."            "The Journey is the reward"
> speff@interlog.com             Info for manufacturers: http://www.trexon.com
> Embedded software/hardware/analog  Info for designers:  http://www.speff.com
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>
>
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