ANATOMY OF COMPUTER-II

ANATOMY OF COMPUTER-II 

PROCESSING DEVICE
CPU [Central Processing Unit] is the unit of computer system which controls the execution of instruction. This is the most important part of computer. CPU is called brain of computer. The central processing unit performs the following functions-

• It store data and instruction received from the input unit
• It controls the operation of different unit as issue the command to all part of computer system.
• It carries out the data processing.
• It directs the result to the output unit.

The control processing unit consists of the following three parts-

1. CU                      [Control Unit]
2. ALU                   [Arithmetic and Logical Unit]
3. MMU                  [Main Memory Unit]

 
Control Unit
Control unit control the internal process of a computer. It controls the input and output process of the computer. The operation controlled by control unit is as follows-

• It gives commands to the input device to transfer data to the memory and also direct the output to be transferred to the output devices.
• It control the transfer of the data from the memory to the arithmetic logic unit for computation, it direct transfer of calculated data back to the main memory.
• It controls the peripheral device and directs them to do the work as and when required.

Arithmetic and Logic Unit
The arithmetic and logic unit are capable to perform addition subtraction, multiplication and division as well as logical operation. The function of ALU is as follows-

• It carries out the arithmetical operation.
• It performs logical operation like taking division based is conditional computing.

Main Memory Unit
The main memory units are storage section of computer is used to store the information that will be used during the computation. The memory section of computer is also used to help any type of data such as- picture, data, video etc.