PROCESSOR

by:maryam jamilah bt abdullah

• Defination of CPU

 A CPU is a central processing unit, the core of a computer's functionality. The CPU is  the main part of a computer that processes the mathematical calculations necessary for a computer's functions. CPUs are commonly called the "brains" of a computer because it cannot function without its CPU component.

• Two components of CPU

1. the arithmetic logic unit (ALU)
2. control unit (CU)          

• Function of CPU   

1. -CPUs are designed to execute a program's instructions. 
2. -Programs are stored as number sequences in the computer's memory.
3. -CPUs carry out programming instructions in the same format as the original stored-program computer developed by John von Newmann.
4. -The instructions are executed in four steps -- fetch, decode, execute and writeback. CPUs fetch by getting the program's instructions, then the instructions are decoded. As the CPU decodes the instruction, it sorts and prioritizes the program's information in preparation for execution.
5. -Execution is where the CPU completes the program's instructions. Upon completion of a program's execution, the CPU writes back the execution results so that it is stored in its internal register or computer memory. When the program is accessed again, the CPU may access the program's write-back information.

• Type of CPU  (most popular) 

1.   INTEL         
2.   AMD CPUs