We can decapsulate atmel avr IC ATMEGA168PV flash code, please view the IC ATMEGA168PV features for your reference:
On the ATMEGA168PV devices, the DRT runs any time the device is powered up. The DRT operates on an internal oscillator. The processor is kept in Reset as long as the DRT is active. The DRT delay allows VDD to rise above VDD min. and for the oscillator to stabilize.
The on-chip DRT keeps the devices in a Reset condition for approximately 18 ms after MCLR has reached a logic high (VIH MCLR) level before Decapsulate Atmel AVR IC ATmega168PV Flash Code.
Programming GP3/MCLR/VPP as MCLR and using an external RC network connected to the MCLR input is not required in most cases. This allows savings in cost-sensitive and/or space restricted applications, as well as allowing the use of the GP3/MCLR/VPP pin as a general purpose input.
The Device Reset Time delays will vary from chip-to-chip due to VDD, temperature and process variation. See AC parameters for details if Decapsulate Atmel AVR IC ATmega168PV Flash Code.
Reset sources are POR, MCLR, WDT time-out and wake-up on pin change. The Watchdog Timer (WDT) is a free running on-chip RC oscillator, which does not require any external components. This RC oscillator is separate from the internal 4 MHz oscillator.
This means that the WDT will run even if the main processor clock has been stopped, for example, by execution of a SLEEP instruction. During normal operation or Sleep, a WDT Reset or wake-up Reset, generates a device Reset. The TO bit (STATUS<4>) will be cleared upon a Watchdog Timer Reset.
The WDT can be permanently disabled by programming the configuration WDTE as a ‘0’ (see Section 9.1 “Configuration Bits”). Refer to the ATMEGA168PV Programming Specifications to determine how to access the Configuration Word after BREAK IC.

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