Oscillator not working at indicated frequency
David VanHorn email (remove spam text)
At 01:47 AM 2/7/01 -0500, you wrote:
>I believe that it is indeed a parallel cut crystal. It's an Epson CA-301,
>just like the 16F877 guide calls for, with a 15 pF cap to ground on either
>side of it.
With a 15pF cap on either side, you're looking at about 10pF load.
A bit light generally, but not enough to cause that much drift!
> Incidentally, I just noticed that its labeling reads
>"184AP9X". Maybe that indicates that the crystal is in fact 18.4 MHz?
>(Anyone know how these things are labeled?)
Sounds suspicious. Call Digikey, and ask for a tech.
The one time they sent me a wrong part, they fedexed the replacement overnight.
>P.S. Thanks, David, for the pointer to your website. I certainly learned
>a few things!
Dave's Engineering Page: http://www.dvanhorn.org
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In reply to: <OFF54E2514.3911882F-ON852569EC.0023267D@pok.ibm.com>
See also: www.piclist.com/techref/microchip/time.htm?key=oscillator
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