The CPU has two main parts: the control unit (CU) which controls all hardware and software operations and issues commands, and the arithmetic logic unit (ALU) which performs processing and arithmetic operations. The CU and ALU communicate via data and control buses, with the data bus transferring data and the control bus sending signals from the CU to other units.

1. CENTRAL PROCESSING
UNIT
PARTS
WORKING

2. PARTS OF CPU
There are two parts of central processing unit (CPU)
ARITHMETIC AND LOGIC UNIT
(ALU)
CONTROL UNIT
(CU)

3. PHYSICAL APPEARANCE

4. CONTROL UNIT(CU)
• Controls all hardwares and softwares.
• Issues commands.
• Temporary storage registers.

5. ARITHMETIC AND LOGIC
UNIT(ALU)
• Performs all processing and arithmetical
operations
• Adder and logic gates
• Temporary storage registers

7. WAY OF DATA TRANSFER BETWEEN ALU CU
AND OTHER UNITS
• The data is transferred
through data bus.
• Control signals are sent
from cu through control
bus.

9. QUICK QUIZZ
 What is the other name of control
processing unit?
 What is the function of CU?
 What is difference between system unit
and Control Processing Unit? Are they
names of a same component?
 How data and control signals are
transferred between CPU and other units?