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Unlock MCU ATmega261A and extract its Heximal out from the memory which include flash and eeprom, then copy the content from microcontroller to blank MCU for the same clone units;

· Bit 5 – H: Half-carry Flag

The half-carry flag H indicates a half-carry in some arithmetic operations. See the Instruction Set description for detailed information.

· Bit 4 – S: Sign Bit, S = N ⊕ V

The S-bit is always an exclusive or between the negative flag N and the two’s complement overflow flag V. See the Instruction Set description for detailed information.

· Bit 3 – V: Two’s Complement Overflow Flag

The two’s complement overflow flag V supports two’s complement arithmetics. See the Instruction Set description for detailed information.

· Bit 2 – N: Negative Flag

The negative flag N indicates a negative result after the different arithmetic and logic operations. See the Instruction Set description for detailed information.

· Bit 1 – Z: Zero Flag

The zero flag Z indicates a zero result after the different arithmetic and logic operations. See the Instruction Set description for detailed information.

· Bit 0 – C: Carry Flag

The carry flag C indicates a carry in an arithmetic or logic operation. See the Instruction Set description for detailed information.

The ATmega261A provides eight interrupt sources. These interrupts and the separate reset vector each have a separate program vector in the program memory space for the subsequent IC code extraction.

All the interrupts are assigned individual enable bits that must be set (one) together with the I-bit in the status register in order to enable the interrupt.

The lowest addresses in the program memory space are automatically defined as the Reset and Interrupt vectors.

The list also determines the priority levels of the different interrupts. The lower the address the higher is the priority level. RESET has the highest priority, and next is INT0 (the External Interrupt Request 0), etc.

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