1.1 Fetch-Decode-Execute Cycle

Question 1

What is the fetch decode execute cycle?

Answer 1

The Fetch Decode Execute Cycle is the method used by the CPU to carry out a single instruction contained in a computer program

Question 2

What is the first stage of the FDE Cycle?

Answer 2

The program counter value is first copied into the Memory Address Register (MAR)

Question 3

What is the second stage of the FDE Cycle?

Answer 3

The MAR fetches the instruction and copies it into the MDR

Question 4

Via which bus is an instruction passed from main memory into the MDR?

Answer 4

The data bus passes an instruction from main memory into the MDR

Question 5

What are the five registers in tbe CPU involved in the FDE Cycle?

Answer 5

The Memory Data Register (MDR)

The Memory Address Register (MAR)

The Program Counter (PC)

The Accumulator

The Instruction Register