Control Unit
This unit controls all inter-unit and inter-peripheral operations of computer. It selects, interprets and directs the execution of the program instructions, thus maintaining order and co-ordination of the entire system.
Arithmetic and Logic Unit(ALU)
It performs the following functions:
Control unit directs ALU ,what to do.
Memory feeds the data.
ALU performs the function and give the result.
Buses
Bus is a circuit which provides a communication path between two or more devices. Microprocessor is connected to other units in the system by means of buses. Buses are of three types ,viz.,Address Bus,Data bus,and Control Bus.
An address bus is used to specify the address of the memory from where data or instructions are to b sent or received. A data bus is used to send and receive data in a microprocessor. Control bus is used to send or receive signals to coordinate the functioning of the processor with the input/output devices and memory.
This unit controls all inter-unit and inter-peripheral operations of computer. It selects, interprets and directs the execution of the program instructions, thus maintaining order and co-ordination of the entire system.
Arithmetic and Logic Unit(ALU)
It performs the following functions:
- Arithmetic calculations such as addition,subtraction,multiplication and division.
- Logical decisions .
Control unit directs ALU ,what to do.
Memory feeds the data.
ALU performs the function and give the result.
Buses
Bus is a circuit which provides a communication path between two or more devices. Microprocessor is connected to other units in the system by means of buses. Buses are of three types ,viz.,Address Bus,Data bus,and Control Bus.
An address bus is used to specify the address of the memory from where data or instructions are to b sent or received. A data bus is used to send and receive data in a microprocessor. Control bus is used to send or receive signals to coordinate the functioning of the processor with the input/output devices and memory.
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