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Fetch-Execute Cycle

Memory

Result R

Number 2 (Y)

Number 1 (X)

Let R = X + Y

ALU

Register 1

(contains Number 1)

Register 2

(contains Number 2)

Accumulator

(Result of Number 1 + Number 2)

Step 1. Control unit fetches instruction

Step 2. Control unit interprets the instruction and sends the 2 numbers to be added into the appropriate registers in the ALU.

Control Unit

Step 4. Result is stored back in memory.

Step 3. Control unit executes the instruction by directing the ALU to add the 2 numbers in the registers 1 and 2 then store the result in the accumulator.

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