I did some research.
Both chips are not able to work with a crystal above 12 MHz. I suspect
the second one was signed for frequency 20 MHz by a mistake..
Igor Pokorny

-----Original Message-----
From: Igor Pokorny [mailto:igorp@applet.cz]
Sent: Saturday, March 20, 2004 11:22 AM
To: 'pic microcontroller discussion list'
Subject: RE: [PIC:] PIC 16F628 an 20 MHz


Hello Jan-Erik,

I use crystal resonators all the time and have never had any problem
with them. This is the first time when PIC marked -20/P refused to work
at 20 MHz. I asked only if someone had the same experience. Tried the
second one (-4/P) to assure myself the fuses are well programmed.

Igor

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