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Attack ATMEGA64A Locked MCU Protection and disable the protection set by fuse bit, flash memory and eeprom memory of atmega64a microcontroller over MCU will be broken, then read embedded heximal out from processor atmega64a memory;

ATmega64A features an internal bandgap reference. This reference is used for Brown-out Detection, and it can be used as an input to the Analog Comparator or the ADC. The 2.56V reference to the ADC is generated from the internal bandgap reference.

The voltage reference has a start-up time that may influence the way it should be used. The start-up time is given in Table 26-3 on page 235. To save power, the reference is not always turned on when recover atmega64 mcu flash embedded heximal. The reference is on during the following situations:

1. When the BOD is enabled (by programming the BODEN Fuse).
2. When the bandgap reference is connected to the Analog Comparator (by setting the ACBG bit in ACSR).
3. When the ADC is enabled.

Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user must always allow the reference to start up before the output from the Analog Comparator or ADC is used by restoring atmega64l flash software.

To reduce power con- sumption in Power-down mode, the user can avoid the three conditions above to ensure that the reference is turned off before entering Power-down mode.

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