**Functions of Central Processing Unit CPU**

**Functions of Central Processing Unit CPU**

The **central processing unit** (CPU) that carries out the instructions of a computer program of a computer is a piece of hardware. It performs the logical, and basic arithmetical, **input**/**output operations** of a computer system.

The functions of a CPU are discussed by its internal units. These functions are below:

**Functions of Arithmetic Logic Unit ALU**

**Functions of Arithmetic Logic Unit ALU**

An arithmetic logic unit (ALU) is a digital circuit used to perform arithmetic and logic operations.

An ALU performs the following two functions:

Example:

(i) It performs arithmetic operations such as addition, subtraction, multiplication, and division.

Example: X=2+3, Y=7-4, Z=X*Y, P=Y/ X.

(ii) It performs logical operations to make a decision.

Example:

Marks=73

IF Marks>=80 THEN

Grade=“A+”

ELSEIF Marks>=75 THEN

Grade=“A”

ELSEIF Marks>=70 THEN

Grade=“A-”

**Functions of Control Unit CU**

**Functions of Control Unit CU**

A Control Unit CU to tell a memory.

A Control Unit CU to tell a memory have been sent to the processor how to respond to the instruction to an arithmetic logic unit and output and input.

A Control Unit CU performs the following function:

It controls all the units connected with the computer system by generating necessary control signals. The possible control signals are

_____

MEMR- Memory Read

MEMW- Memory Write

___

IOR-Input Output Read

IOW-Input Output Write

### What are Functions of CPU and Functions of ALU?

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✓Functions of Control Unit CU,

✓Functions of Control Processing Unit CPU,

✓Functions of Arithmetic Logic Unit ALU,

✓What is ALU, CU, CPU,

✓Example of Arithmetic Logic unit,

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