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Clone ATMEGA328 ATMEL Microcontroller Firmware is a process to break secured IC ATMEGA328 MCU security fuse bit and then extract microprocessor atmega328 source code out from its flash and eeprom memory;

The External Interrupt 0 is activated by the external pin INT0 if the SREG I-flag and the corresponding interrupt mask are set. The level and edges on the external INT0 pin that activate the interrupt are defined in Table 14-2. The value on the INT0 pin is sampled before detecting edges.

If edge or toggle interrupt is selected, pulses that last longer than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an interrupt when extract embedded firmware from microcontroller atmega328. If low level interrupt is selected, the low level must be held until the completion of the currently executing instruction to generate an interrupt.

When the INT1 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the external pin interrupt is enabled. The Interrupt Sense Control1 bits 1/0 (ISC11 and ISC10) in the MCU general Control Register (MCUCR) define whether the external interrupt is activated on rising and/or falling edge of the INT1 pin or level sensed.

Activity on the pin will cause an interrupt request even if INT1 is configured as an output. The corresponding interrupt of External Interrupt Request 1 is executed from the INT1 Interrupt Vector.

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