How do I use the brown-out detection that is apparently built into the Arduino Uno? I need to save off eeprom before the power goes completely off, and do not want to write to eeprom unless/until it is necessary.
I've seen some data on setting trigger voltages and stuff (fuses?), but I am completely unsure of how to execute code when the brown-out occurs. I'd hope this could be set up somewhat like the external interrupts. I don't want to continuously check some memory value. I'm currently using interrupt 0 to watch for a button push. Interrupt 1 is available, but I'm guessing the brown-out capability in the Arduino is going to function differently from those 2 external interrupts.