Fetch Decode Execute cycle

Question 1

What is the fetch-decode-execute

Answer 1

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

Question 2

Which bits happen where

Answer 2

Fetch between RAM and CPU, decode and execute in registers in CPU

Question 3

What registers are used

Answer 3

The MDR (Memory Data Register)
The MAR (Memory Address Register)
Program Counter
Accumulator
Instruction Register

Question 4

Describe what happens in the ‘fetch’ part

Answer 4

It’s responsible for getting an instruction or data from main memory into the CPU, sent to PC. Then copied to MAR, then CU loads address onto address bus,