fetch decode execute

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Last updated: November 16, 2021

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Hint
Answer
1
The address of the next instruction is copied from the PC to the MAR
2
The instruction held at that address is copied to the MDR
3
Simultaneously, the contents of the PC are incremented
4
The contents of the MDR are copied to the CIR
5
The instruction in the CIR is decoded
6
Additional data, if required by the instruction, is fetched from memory
7
The additional data is then passed to the accumulator
8
The instruction is executed and the result is held in the accumulator or sent to main memory

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