It could be that what you were using before is a parallel cut crystal, since
there is a section in the 16F87x manual stating that only series cut
crystals will operate.  I'd imagine that all the PICs are the same that way,
though I haven't checked.

At least, that's my best guess.

--Brendan

----- Original Message -----
From: "Lawrence Lile" <llile@TOASTMASTER.COM>
To: <PICLIST@mitvma.mit.edu>
Sent: Thursday, June 13, 2002 3:22 PM
Subject: Re: [PIC]: Will an unprogrammed chip oscillate?


> After fixing a few crossed ICSP wires, the chip programs and verifies OK.
>
> Well, the plot thickens.  I had a 4 MHz crystal and two capacitors (22 pF,
> IIRC), and still could not get my PIC to oscillate.
>
> I replaced the crystal and caps with a 4 MHZ packaged ceramic resonator
with
> internal caps, and the oscillator strarts fine.
>
> So what causes one kind of crystal to not oscilate with the PIC, another
to
> work OK?  I've never really run into this before.
>
> --Lawrence

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