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'[PIC]: RC Oscillators and 16F87A'
2002\07\04@232340 by Peter Lawson

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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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2002\07\04@233007 by Larry G. Nelson Sr.

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Did you set the configuration fuses for the RC mode?



At 12:33 PM 7/5/02 +0930, you wrote:
{Quote hidden}

Larry G. Nelson Sr.
L.NelsonspamKILLspamieee.org
http://www.ultranet.com/~nr

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2002\07\04@233239 by Rick C.

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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:

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