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Break AVR MCU ATMEGA128L fuse bit and readout embedded firmware from atmega128l microprocessor flash memory which can be referred as AVR Microcontroller ATMEGA128L Flash Heximal Restoration;

The Watchdog Timer is clocked from a separate On-chip Oscillator which runs at 1MHz. This is the typical value at VCC = 5V. See characterization data for typical values at other VCC levels. By controlling the Watchdog Timer prescaler, the Watchdog Reset interval can be adjusted as shown in Table 17 on page 44.

The WDR – Watchdog Reset – instruction resets the Watchdog Timer. The Watchdog Timer is also reset when it is disabled and when a Chip Reset occurs when breaking off atmega128l mcu flash memory fuse bit. Eight different clock cycle periods can be selected to determine the reset period. If the reset period expires without another Watchdog Reset, the ATmega8 resets and executes from the Reset Vector. For timing details on the Watchdog Reset, refer to page 41.

To prevent unintentional disabling of the Watchdog, a special turn-off sequence must be fol- lowed when the Watchdog is disabled. Refer to “Watchdog Timer Control Register – WDTCR” for details. This bit must be set when the WDE bit is written to logic zero. Otherwise, the Watchdog will not be disabled.

Once written to one, hardware will clear this bit after four clock cycles. Refer to “Bit 3 – WDE: Watchdog Enable” on page 44for a Watchdog disable procedure when unlock microcontroller atmega128l flash heximal from memory. In Safety Level 1 and 2, this bit must also be set when changing the prescaler bits. See the Code Examples on page 45.