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Machine cycle.

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Presentation on theme: "Machine cycle."— Presentation transcript:

1 Machine cycle

2 What is the machine cycle?
4 steps that processors follow to execute program instructions.

3 Step 1 The control unit fetches the instruction from the memory

4 Step 2 The control unit decodes
the instruction and directs the necessary data to the ALU

5 Steps 1 and 2 are called: instruction time or I-time

6 Step 3 The ALU executes the arithmetic or logical instruction.

7 Step 4 The ALU stores the result of this operation in memory or in a register

8 Steps 3 and 4 are called: execution time or E-time

9 The combination of I-time and E-time is called:
the machine cycle.

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