Reverse ATmega8A Microchip Memory Code needs to decode atmega8a microprocessor’s tamper resistance system, then readout MCU ATmega8a firmware from its flash and eeprom memory;
There are basically two types of interrupts. The first type is triggered by an event that sets the Interrupt Flag. For these interrupts, the Program Counter is vectored to the actual Interrupt Vector in order to execute the interrupt handling routine, and hardware clears the corresponding Interrupt Flag.
Interrupt Flags can also be cleared by writing a logic one to the flag bit position(s) to be cleared. If an interrupt condition occurs while the corresponding interrupt enable bit is cleared to duplicate avr microprocessor atmega8 protected firmware, the Interrupt Flag will be set and remembered until the interrupt is enabled, or the flag is cleared by software.
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Similarly, if one or more interrupt conditions occur while the global interrupt enable bit is cleared, the corresponding Interrupt Flag(s) will be set and remembered until the global interrupt enable bit is set, and will then be executed by order of priority.
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The second type of interrupts will trigger as long as the interrupt condition is present. These interrupts do not nec- essarily have Interrupt Flags. If the interrupt condition disappears before the interrupt is enabled, the interrupt will not be triggered.