What is a CPU?

What is a CPU?


CPU( Central Processing unit)

It is the most important unit of the computer system. CPU is considered as the brain of computer. in human body, all major decisions are taken by the brain and all other parts of the body function as directed by the brain. Similar to the human brain, in computer system, all major calculations, manipulations and comparisons are made by the CPU. The CPU is also responsible for activating and controlling the operations performed by all other units of the computer system.

What is CPU, What is ALU, What is CU, What is MU, Types of CPU, Memory Unit, Arithmetic Logic Unit, Control Unit,
Central Processing Unit



The major parts of a CPU are:
a) Arithmetic and Logical Unit (ALU)
b)Control Unit (CU)
c)Memory Unit (MU)

Arithmetic Logic Unit(ALU)

 It performs all the mathematical and logical operations.The data and instructions, stored in the primary memory, are transferred to ALU for processing. Results generated by the ALU is transferred to the primary memory. After completion of processing, the final results are sent to an output device.
ALUs are designed to perform four basic arithmetic operations- add, subtract,multiply,divide- and logic operations or comparisons such as less than, equal to, or greater than.

Control Unit(CU)

This unit controls and directs all the other units of the computer.The control unit is able to maintain order and direct the working of the entire computer system. Although it does not perform any process on data, the control unit acts as the central nervous system for all the other components of the computer. Control unit obtains instructions from the program stored in the main memory, interprets the instructions  and issues electrical signals that cause other units of the system to perform their functions.

Memory Unit(MU)

The data is being process by the CPU resides here. The function of the memory unit is to store information. The main memory stores programs along with data, which are to be executed. It also stores necessary programs of system software, which are required to execute the user's programs. The main memory is directly addressed by the CPU.

Comments

Post a Comment

Popular posts from this blog

Difference between Compiler and Interpreter

Image
Difference between Compiler and Interpreter Do you ever hear about Compiler and Interpreter? These are the programs which translates the high level language into machine language. Let’s know more about these programs. Compiler A program that translates high level language program into machine language program is known as compiler. It checks all kinds of limits, ranges, errors etc. But its program execution time is more and occupies a larger part of the memory. It has low speed and low efficiency of memory utilization. If a compiler runs on a computer for which it produces the object code it is known as a self or resident compiler , If a compiler runs on a computer other than that for which it produces object code, it is known as a cross compiler . The compiler derives its name from the way it works, looking at the entire piece of source code and collecting and reorganizing the instructions. Compilers require some time before an executable program emerges. However, programs prod
Read more

Linux File System

  File System Linux treated everything as a file. Ever a directory is treated as a file and contains entries for several other files. All the hardware devices, such as (input/output) I/O devices, storage devices, etc. are all treated as files. The Linux file system is organised in a hierarchy which start with the root directory. The root directory is represented by forward slash (/) under the root directory there are several system directories and the name directory. /bin : - This directory contains executable program file (binary file). This directory contains all the commands of Linux in the same way as all the commands of DOS are stored in the Command.Com file. /dev : - This directory contains the special device files for example, the printer may be a file known as prn in this directory. The hard disk may be hda file and its first partition would be hda.   /etc : - This directory contains all the system wise configuration information as text files. /lib : - This directory cont
Read more

History of Computers

Image
History of Computers History means the systematic information (study) about the past of anything under the topic history of computers followings are some important points. 1) Abacus      Abacus means a calculating board. It is known as the first calculating machine invented by Tim  Cranmer . It  was first developed by China. It is still commonly used by the peoples who are blinds. It is also known as Cranmer's Abacus.       2) Pascal's Adding Machine     In 1642 French scientist and philosopher Blaise Pascal .invented the first practical mechanical            calculator. It was known as adding machine that could Add and Subtract. It is also called  Pascaline.   3) Gott fried Leibniz     In 1671 , German mathematician and philosopher Gottfried Wilhelm Leibniz develops an advance    version of pascal's adding machine. It could Add, Subtract as well as Multiply, Divide and workout         Square root. 4) George Boole       George Boole invented a new branch of mathematics
Read more