Hi,

In a project at hand, I would like to save some data into the onboard
EEPROM of a PIC16F870 when the power fails or is turned off. A large
capacitor in the power supply ensures that when the main supply fails,
there are still a few hundred milliseconds before the supply into PIC
touches zero. How can one detect such a power failure and then
immediately launch into the EEPROM write subroutine (while there is
juice in the capacitor)? I don't really want to save the data regularly
after every few seconds (analogous to Autosave in MS Word), but only
when the power goes.

Thanks,
Mohit.

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