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Unlock Secured ATMEGA32U2 Processor Heximal from its locked memory including flash memory and eeprom memory, reverse engineering atmega32u2 microcontroller fuse bit, and extract source code from atmega32u2 MCU;

When entering Power-down sleep mode while an EEPROM write operation is active, the EEPROM write operation will continue, and will complete before the Write Access time has passed.

However, when the write operation is completed, the Oscillator continues running, and as a consequence, the device does not enter Power-down entirely. It is therefore recommended to verify that the EEPROM write operation is completed before entering Power-down when unlocking atmega8a microcontroller flash program.

During periods of low VCC, the EEPROM data can be corrupted because the supply voltage is too low for the CPU and the EEPROM to operate properly. These issues are the same as for board level systems using EEPROM, and the same design solutions should be applied.

An EEPROM data corruption can be caused by two situations when the voltage is too low. First, a regular write sequence to the EEPROM requires a minimum voltage to operate correctly in the process of decoding atmega8a microprocessor heximal data. Second, the CPU itself can execute instructions incorrectly, if the supply voltage is too low.