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.