>In message  <19970314.205554.11111.1.HaroldHallikainen@juno.com>
> PICLIST@MITVMA.MIT.EDU writes:
>>         Does anyone have experience on using ceramic resonators with
>> built-in capacitors on the 16c74?  We're using a 16 MHz resonator with
>> the oscillator in the HS mode and find that about 1/3 of the resonators
>> don't oscillate.  Most resonator datasheets don't specify units to work
>> with the pic chips.
>>         Any ideas appreciated!
>>
>
>Harold,
>
>
>I have been using them with no problems on a 16C73. However, I seem
>to remember a few weeks ago that someone (was it Myke) mentioned
>he was having problems with a 16C73A; something about the
>capacitance of the PIC osc pins being too high.
>
>Maybe someone can remember better than me ...

Yeah, it was me.  I was using ECS Resonators (which typically have 30 pF
built in) and I couldn't get 12 MHz, 16 MHz, or 20 MHz Resonators to work.

I haven't tried ones without internal caps yet and added my own external
resistance.

As for the suggestion of putting a 10 Meg Resistor across the resonator (I
presume the OSC1/OSC2) it doesn't work (at least not with the ECS Parts).

myke

"Some people say that foreign cars handle best, while others say domestic.
For my money, nothing handles as well as a rental car." - P.J. O'Rourke