Re: Crystal problems/questions
From: Leon Heller (leon_heller_at_hotmail.com)
Date: 08/07/04
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Date: Sat, 7 Aug 2004 09:40:35 +0100
"Brett" <bsa22@cornell.edu> wrote in message
news:Xns953E18102F3C8bsalistsyahoocom@132.236.56.8...
> Hi All,
>
> I'm working on building a small prototype for a PCB we would like to
> have built. It is based on an ST7262 uP, and my first step has been to
> put this processor on a breadboard, hook up some of the basics like Vdd,
> reset, etc, and then attach the crystal. As far as I can tell on my
> first attempt, the crystal is not resonating, at least when I use an
> oscilloscope to probe it. I have a few ideas about what could be wrong,
> but nothing I'm really sure about. I would appreciate it if anyone
> could check over what I'm doing and let me know if it makes sense. My
> circuit looks like this:
If it's one of those solderless breadboards, make sure that everything is
actually connected. The crystal etc. might not actually be making proper
contact.
Someone I know breadboarded a PIC circuit and didn't bother using capacitors
on the crystal, there was enough stray capcitance for it to oscillate.
Leon
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