Is anybody having a problem with the POR bit in a PIC12C672?

We are doing an IR Remote which is supposed to sleep until a button is
pressed.  This part works fine.

The problem is that when we change batteries, we want it to go into a
"speak to me" mode until a timer times off.  What we are finding is that
the POR bit (PCON.1) isn't changing state while we change batteries, so we
end up not being able to communicate to the device (we want to use PCON.1
to tell us that we've experienced a serious power outage).

Anybody else have comments on the POR bit?

Thanks.

Andy
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