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Machine cycle
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What is the machine cycle?
4 steps that processors follow to execute program instructions.
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Step 1 The control unit fetches the instruction from the memory
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Step 2 The control unit decodes
the instruction and directs the necessary data to the ALU
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Steps 1 and 2 are called: instruction time or I-time
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Step 3 The ALU executes the arithmetic or logical instruction.
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Step 4 The ALU stores the result of this operation in memory or in a register
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Steps 3 and 4 are called: execution time or E-time
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The combination of I-time and E-time is called:
the machine cycle.
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