It *might* work with 3 or another odd number, however.

(I wouldn't bet on it).

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Andrew Warren" <aiw@CYPRESS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, April 22, 2004 12:42 PM
Subject: Re: [PIC]: Two PICs share an oscillator?


> Gerhard Fiedler <PICLIST@mitvma.mit.edu> wrote:
>
> > > If you just want to use a crystal instead of a full-blown
> > > oscillator, daisy-chain the two PICs: One crystal leg to PIC#1's
> > > OSC1, PIC#1's OSC2 to PIC#2's OSC1, PIC#2's OSC2 to the other
> > > leg of the crystal).  Some tinkering with the load capacitors is
> > > likely to be required.
> >
> > Hey, that's something new... You think that works better than
> > connecting the crystal to one PIC in a traditional form, and then
> > going from this PIC's clock output to the other PIC's clock input?
>
>     Actually, no.
>
>     Daisy-chaining two PICs like that shouldn't work at all, for a
>     number of reasons, not the least of which is the added
>     180-degree phase-shift of the second PIC's oscillator.
>
>     I have no idea what I was thinking; please forget you ever read
>     that post.
>
>     -Andrew
>
> === Andrew Warren -- aiw@cypress.com
> === Principal Design Engineer
> === Cypress Semiconductor Corporation
> ===
> === Opinions expressed above do not
> === necessarily represent those of
> === Cypress Semiconductor Corporation
>
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