>    I have a PIC12C508A with External Reset selected.   Upon powerup,
>    all works as expected.   But when you pull RESET low momentarily
>    and then release it to reset the part, it doesn't start running
>    again until you cycle power.   I've tried using a resistor/capacitor
>    combo on MCLR, but that doesn't seem to help anything.   All seems to
>    be as it should except for the fact that MCLR won't reset the processor
>    properly.   If you cycle power again, it works just fine.
>    Has anyone on the list seen this phenomon?  Know what causes it?
>    Any help here would be greatly appreciated.   Please advise.

You can't just "release" MCLR.  It is a CMOS input.  It has to be externally
driven high to release the part from reset.  A 10K ohm resistor to Vdd is
fine.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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