Fetech Decode - Execute Cycle

Question 1

Fetch

Answer 1

The computer fetches an instruction (transfers from main memory to instruction registration)

Question 2

Decode it

Answer 2

determines the opcode and fetches necessary data

Question 3

Execute

Answer 3

Performs operation

Question 4

Steps

Answer 4

1) Gets address from Program Counter
2) Copy contents of PC to MAR
3) Incremenet PC
4) Copy instrcutiom provided to by MAR to the Memory Data Register
5) Copy contents of MDR to Current Instruction Reguster
6) Decode and Execute Current Instruction
8. Repeat