Central Processing Unit (CPU)

CPU stands for central Processing Unit. It works same as our brain works in the body or you can say that it is the brain of any computer system, that is responsible in controlling all the other components attached to the computer system such as keyboard, mouse, memory, and printer etc.

The CPU of a small computer has a single microprocessor, whereas the CPU of any large computer may contain multiple microprocessor.

Note - Microprocessor does one specific job. A microprocessor contains a CU and ALU. CU stands for control unit and ALU stand for arithmetic and logic unit.

When main memory is added to microprocessor then it becomes CPU. Therefore, here are the major sections of a CPU:

  • (CU) control unit
  • ALU (Arithmetic and logical unit
  • Primary memory

Now let's briefly describe about the above major sections of a CPU.

Primary memory

It is the main part of any computer system, as this is the main memory that keeps necessary operating system such as MS-DOS or Windows.

Primary memory or main memory holds data which is currently manipulated by central Processing Unit as you all known that this memory is present inside the CPU, therefore you can also says that this is the internal memory or RAM. RAM stands for Random Access Memory.

Control unit (CU)

This section of CPU is used to control the entire working of a computer system. This unit also controls the transfer of data between memory and input/output devices or I/O devices.

Arithmetic logic unit (ALU)

All calculations are performed in this section of unit. ALU is also used to make all the decisions inside computer system.

All ALUs are designed to perform all the basic arithmetic operations and logical operations which are:

  • addition
  • subtraction
  • multiplication
  • division
  • less than
  • greater than
  • equal to

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