I'm looking at the programmable low voltage detect in the 16F636. I'd like
to enable it now and then to check the battery voltage instead of leaving
it on all the time (draining the battery). It LOOKS like the PLVD is edge
triggered. The startup instructions say:

To setup the PLVD for operation, the following steps
must be taken:
=95 Enable the module by setting the LVDEN bit of the
LVDCON register.
=95 Configure the trip point by setting the LVDL<2:0>
bits of the LVDCON register.
=95 Wait for the reference voltage to become stable.
Refer to Section 8.4 =93Stable Reference
Indication=94.
=95 Clear the LVDIF bit of the PIRx register.
The LVDIF bit will be set when VDD falls below the
PLVD trip point. The LVDIF bit remains set until cleared
by software.

But, what if Vdd is already below LVDIF when I start it? It seems like it
will never be set again. Am I reading that correctly? Any ideas on how to
get around that? I'd like to only check the battery when the device is
connected to an external computer that is asking the battery to be
checked.

THANKS!

Harold



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