Calvin wrote:
>I am using the ZTT-20.00MX part from ECS Inc. with complete success. I have
>assembled about 50 devices using the 16C57 with this resonator and have yet
>to have a single failure.
>
>Digi-Key part# X909-ND

I'm surprised at this - I had a lot of problems with this part on a 16C73A
(and ended up going to a ZTA with external caps) because the built in
capacitors of the ZTT (30 pF) were too much for the PICMicro at this speed.

I Just looked at the 16C5x datasheet and it it indcates that for ceramic
resonators (up to 16 MHz), 10 pF caps are required (and this was born out by
my experience with the 16C73A).

To the original requester, why don't you float the centre pin of the
resonator (ie disconnect it from ground) and wire in some caps and see what
happens?

myke

PICLite has been upgraded!  Check out version 2.00a at:

http://www.myke.com/piclite

PICLite now includes a Macro Processor that allows structured programming
language constructs ("if/else/end", "while/end" and "for/end").

Look in on the life of the Rabitte family in Dublin; Roddy Doyle's
"Barrytown Trilogy" in the Book Room this week,

http://www.myke.com/Book_Room