CENTRAL PROCESSING UNIT Written by: Gizem Gulsen

INTRODUCTION The central processing unit is where all the calculations and logic operations take place. CPU performs data-processing operations.

Main Parts of CPU Arithmetic Logic Unit (ALU) Control Unit (CU) Registers

Arithmetic Logic Unit ALU performs the required microoperations(addition,subtraction,shifti ng,increment,decrement etc.) for executing the instructions. Alu performs an operations and the result of the operation is transferred to a destination register.

Control Unit The control unit(CU) supervises the transfer of information among the registers and instructs the ALU as to which operation to perform.

Model of Control Unit

Registers A register is a group of flip-flops with each flip-flop capable of storing one bit of information. I OpCode Address IR

Resources Computer System Architecture M.Morris Mano Computer Organization and Architecture William Stallings