Cpu
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Transcript of Cpu
CENTRAL PROCESSING UNIT
Introduction
It is the brain of the computerFunctions of CPU
Manages the startup process Controls the flow of data, input and output
operations Loads program instruction and data into
memory and carries out the processing of data
Manages file and disk operations such as saving, retrieving, deleting files and formatting disks.
Components of CPU
CPU consists of ALU - Arithmetic Logic Unit Control Unit Immediate Access Store
The entire CPU is built on a single silicon chip called microchip and also known as Microprocessor.
CPU
INPUT OUTPUT
IMMEDIATE ACCESS
ALU CU
Arithmetic Logic Unit
Where the computer processes data either by manipulating it or acting upon it.
Consists of: Arithmetic Part - Performs the
calculations on the data e.g. 3 +2 = 5 Logic Part - Deals with logic and
comparisons. e.g. works out if one value is greater, less than or equal to another
Control Unit
CU main jobs: Monitors all the operations of the
computer system Making sure that all parts of the computer
do their jobs according to the instructions and in a proper sequence.e.g. When you want to print, the CU will keep
a check that the instruction are sent to the printer correctly.
Controls the flow of data within the CPU
Immediate Access Store
Holds the data and programs at the instant by the CU
It is also the working space of the computer. The processor brings all the program and
data to the memory unit before processing To make sure all operations are performed
in a proper sequence, the CPU uses the help of a clock
The clock is a device that synchronizes all the activities of a CPU, it ticks millions of times every second.
Speed of a Computer
Measured in hertz (Hz)One Hz means One tick per second or
One cycle per secondOne kilohertz (kHz) means 1000
cycles per second and One megahertz (mHz) means One million cycles per second
1mHz allows 1 million sets of activities to be completed per second
Speed of a Computer
The Computer power of a computer is determined by the Microprocessor type and its clock speed
Research activity. Find out some microprocessor models and its speed produced. Don’t forget the year it’s introduced.e.g. Pentium - Very high speed (66mHz) -
1993