We can recover locked microprocessor ATMEGA164PV source code, please view the locked microprocessor ATMEGA164PV features for your reference:
To enter any of the three sleep modes, the SE bit in locked microprocessorCR must be set (one) and a SLEEP instruction must be executed. The SM1 and SM0 bits in the locked microprocessorCR register select which sleep mode (Idle, ADC Noise Reduction or Power-down) will be activated by the SLEEP instruction (see Table 7).
If an enabled interrupt occurs while the locked microprocessor is in a sleep mode, the locked microprocessor wakes up. The locked microprocessor is then halted for four cycles, executes the interrupt routine and resumes execution from the instruction following SLEEP if Recover Locked Microprocessor ATmega164PV Source Code.
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.
If a reset occurs during sleep mode, the locked microprocessor wakes up and executes from the Reset vector. When the SM1/SM0 bits are “00”, the SLEEP instruction forces the locked microprocessor 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 locked microprocessor 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 when Recover Locked Microprocessor ATmega164PV Source Code.
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 locked microprocessor 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 after RECOVER MCU.
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.

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