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Crack MCU ATmega164PV Heximal and readout the firmware such as binary or heximal from Microcontroller which has been unlocked and reset the status to un-encrypted one;

Crack MCU ATmega164PV Heximal

To enter any of the three sleep modes, the SE bit in MCUCR must be set (one) and a SLEEP instruction must be executed. The SM1 and SM0 bits in the MCUCR register select which sleep mode (Idle, ADC Noise Reduction or Power-down) will be activated by the SLEEP instruction.

If an enabled interrupt occurs while the MCU is in a sleep mode, the MCU wakes up. The MCU is then halted for four cycles, executes the interrupt routine and resumes execution from the instruction following SLEEP.

On wake-up from Power-down mode on pin change, the two instructions following SLEEP. The contents of the register file, SRAM, and I/O memory are unaltered when the device wakes up from sleep to ease the process of MCU program extraction.

If a reset occurs during sleep mode, the MCU wakes up and executes from the Reset vector. When the SM1/SM0 bits are “00”, the SLEEP instruction forces the MCU into the Idle mode, stopping the CPU but allowing the ADC, Analog Comparator, Timer/Counters, Watchdog and the Interrupt system to continue operating.

This enables the MCU to wake up from external triggered interrupts as well as internal ones like the Timer Overflow interrupt and Watchdog Reset. If the ADC is enabled, a conversion starts automatically when this mode is entered.

If wake-up from the Analog Comparator interrupt is not required, the Analog Comparator can be powered down by setting the ADC-bit in the Analog Comparator Control and Status Register (ACSR).

This will reduce power consumption in Idle mode. When the SM1/SM0 bits are “01”, the SLEEP instruction forces the MCU into the ADC Noise Reduction mode, stopping the CPU but allowing the ADC, the external interrupt pin, pin change interrupt and the Watchdog (if enabled) to continue operating.

Please note that the clock system including the PLL is also active in the ADC Noise Reduction mode. This improves the noise environment for the ADC, enabling higher resolution measurements. If the ADC is enabled, a conversion starts automatically when this mode is entered. In addition to Watchdog Time-out and External Reset, only an external leveltriggered interrupt, a pin change interrupt or an ADC interrupt can wake up.