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Instruction execution has 5 basic stages:

1. Fetch instruction:

The task of reading the next instruction from memory into the instruction register.

2. Decode instruction:

The task of determining what operation the instruction on the instruction register represents. Ex. add, move

3. Fetch oprands:

The task of moving the instructions operands data into appropriate register.

4. Execute operation:

The task of feeding the appropriate registers through the ALU and back into an appropriate register.

5. Store results:

The task of writing a register into memory.

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