I want to make a system, which when turned off saves the data in some registers by writing to EEPROM. I've enabled the brown out detection at 4.0V, so that when it drops to 4V, it will reset and enter the subroutine which will write into the EEPROM. For this I've put a 3300uF cap across Vcc to slow the rate of the voltage drop.
I want to know whether such a setup is possible. I will post the code if anyone wants it.