3.1 The Role of the CPU

Question 1

Components of a computer designed using Von Nuemann Architecture.

Answer 1

• I/O Device
• CPU
• Memory
• Registers
• Busses

Question 2

The CPU contains the ___ and its function is ___.

Answer 2

It contains the CU, ALU and Registers and its functions is to process all data.

Question 3

Registers:

Answer 3

• MAR (Memory Address Register)
• MDR (Memory Data Register)
• ACC (Accumulator)
• PC (Program Counter)
• CIR (Current Instruction Register)

Question 4

Function of a Register

Answer 4

High speed storage areas located within the CPU. All data is stored in a register before being processed.

Question 5

Function of the PC:

Answer 5

Holds the address of the next instruction to be processed.

Question 6

Function of the MAR:

Answer 6

Holds the address of the instruction that needs processing.

Question 7

Function of the MDR:

Answer 7

Holds the intruction that needs processing.

Question 8

Function of the CIR:

Answer 8

Holds the data currently being processed.

Question 9

Function of the ACC:

Answer 9

Holds the data or results of an operation performed in the ALU during processing.