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Q

Hard 3 Marks

Computer Studies Central Processing Unit (CPU)

A program instruction says: add two numbers and store the result. Which sequence of CPU components is involved?

A CU fetches then IR decodes then MAR executes

B PC provides address CU fetches and decodes ALU adds ACC stores result

C MDR fetches ALU decodes CU executes

D IR fetches MAR decodes MDR executes

Explanation

PC provides the instruction address CU fetches from memory and decodes it the ALU performs the addition and the ACC stores the intermediate result. All components work together.

Reference: Computer Studies Textbook , Page 5

Hint

Trace the instruction through each CPU component in order.

Explanation

Hint

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