Well I tried this, but still no dice.

I found the reference to this in the datasheet -- DS30221B, pg 102, secti=
on=20
11.18.  Says "Note 1:  The High Voltage Programming mode is always availa=
ble,=20
regardless of the state of the LVP bit, by applying Vihh to the !MCLR pin=
=2E"

If it's a bug, then it still doesn't work on mine when I forced LVP low, =
and=20
I've used about a dozen 16F872's to date w/o the problem.  More important=
ly,=20
if this is a bug, it seems like this would affect ICSP as well, so what=20
happens when/if I want to program a chip in-circuit, and the LVP pin is b=
eing=20
used for something else?  This may be a problem.

Will pick up the regulators now and complete my PCB-version, so I can red=
uce=20
variables for debugging this problem.

Cheers,
-Neil.



On Wednesday 30 April 2003 04:29, Michael Rigby-Jones scribbled:
> Yes, the LVP pin should always be pulled low when programming.  LVP ena=
bled
> PICs come set for LVP operation from the factory, if this line floats h=
igh
> enough the PIC will enter the programming state at inoportune moments.=20
> Some people have never encountered this, but I have definately had it
> happen to me.
>
> Mike
>

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