In message  <2.2.16.19970326163556.3aafef0c@netins.net> PICLIST@MITVMA.MIT.EDU
 writes:
> I spoke with Jim Simmons at Microchip about using a 20MHz resonator on a PIC
> (16C621), and he told me that many people were not able to make this work,
> but he had spoken with one customer that hadn't had any trouble with his
> particular brand; unfortunatly Jim could not remember what brand it was that
> worked.  Has anyone discovered a working, reliable 20MHz resonator solution?
>
> Also, anyone have any thoughts on whether or not a 20MHz resonator would be
> good for reliable 9600 Baud serial communication?
>

Todd,

I have used what I believe to be a Murata 3 terminal resonator on
a 16C73 with no problems. The part number is CST20.00MXW.

It was used on an early prototype, but was repalced after a number
of weeks with an oscillator, so I can't comment on whether it works
with different batches of PICs and resonators.

Regarding rs232 comms, I have used a 4MHz resonator to bit bash
rs232 transmission and reception on a 16C84 with no problems.

Regards,


Mike Watson