The datasheet has the Fmax of 4mhz. Make sure you have the configuration bit
set to RC osc and your RC on OSC1 pin 16
Rick

Peter Lawson wrote:

> Hi Folks
> Just trying to see what can be done with a 16F87A, I tried to kick it over
> with an RC oscillator as described in the various MicroChip appnotes.
> (Resistor from supply to oscillator pin, capacitor from pin to ground)
> I can't seem to get it going. It starts OK with all the crystals I have,
> anywhere between a couple of hundred KHz, all the way out to 16MHz, but not
> with a resistor-capacitor pair. I have tried 40pf/5K (5MHz), 20pf/5K
> (10MHz), 40pf/6.2K (4MHz) plus other combinations that are equally
> reliable - in that they don't start!
> I am doing this on a breadboard, so I guess there is plenty of stray
> capacitance - is this the problem. - ? Suggestions, comments, abuse ...
>
> Peter L
>
> First posting here, so please excuse if this has been covered a million
> times already. (I can't find anything helpful in archives).
>
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