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The functioning of a CPU can be demonstrated with the help of the following block
diagram:
Arithmetic
INPUT Unit OUTPUT Unit
Logic Unit
Control Unit
Memory Unit
CPU
Arithmetic Logic Unit (ALU)
The ALU (Arithmetic Logic Unit) performs arithmetic operations such as addition,
subtraction, multiplication, and division. It also handles logical comparisons, such
as checking whether values are greater than, less than, or equal to one another.
Control Unit (CU)
The CU (Control Unit) manages coordination among all parts of the CPU. It
receives data and instructions from the memory unit and directs them to the ALU
(Arithmetic Logic Unit) in a sequential manner.
Memory Unit (MU)
The MU (Memory Unit) holds the data and instructions provided to the computer,
along with the results of any processing.
Output Devices
A computer displays the results of processed data through output devices.
Examples of output devices are the monitor, printer, speakers and projector.
A Computer System 9

