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.
15 14
12 11
0
IR
I
OpCode
Address
Resources
• Computer System Architecture
M.Morris Mano
• Computer Organization and Architecture
William Stallings