Hi,

thanks anybody for the hints, very helpful!

1. I read paragraph 12.3.5. but when 12.3.6. started with power-up stuff I
stopped read=EDng, power UP was not my problem. I learned: Better read some
pages more.

2. Some guys were discussing, if BOR is useful for battery detection. Yes,
you are right, if the circuitry is always operated in "full power mode". In
this case it will never leave the brown out condition. But in my device the
user starts the software by a key press, then it's operating for 15 or 20
minutes, consuming much power, but after that it goes to sleep mode,
consuming nearly zero amps. During this sleep the batteries may recover and
next time my PIC sees a "full" battery, but during operation the voltage ca=
n
go low again.
That's why I was looking for this distinction.

What I intend to do:

I have a variable which is reset by every cold boot (initialized to zero
when PIC starts).
When user presses the key, this variable is set to 1 (I assume that a BOR
will happen)
After normal operation (when no BOR happened) I reset this variable again
and the PIC goes to sleep.
So when it wakes up again, it sees a reset variable. Fine.
But when a BOR occured during operation, the software will never reach the
end of the software, thus the variable stays set and on next start the
software sees a set variable and based on this I can decide to disable
starting the software again. Just blink some leds and go to sleep again.

Anyone did this before? Hopefully I have some time tonight to write the
software.

Best regards

Peter


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