How does an input device of a computer system know that it is time for it to feed data to storage unit? How does its ALU know what should be done with the data once it recives them. Moreover, how it is that the computer sends only the results for output to an output device and not the intermediate results, All this possible due to the control unit of the computer system.
A computer's control unit does not perform any actual processing of jobs, but acts as the central nervous system for other components of the computer system. It manages and coordinated the operations of all other components. It obtains instructions from a program stored in main memory, interprets the instructions, and issues signals causing other units of the system to execute them.
A control unit (CU) handles all processor control signals. It directs all input and output flow, fetches code for instructions from microprograms and directs other units and models by providing control and timing signals. A CU component is considered the processor brain because it issues orders to just about everything and ensures correct instruction execution.
A control unit or CU is circuitry that directs operations within a computer's processor. It lets the computer's logic unit, memory, and both input and output devices know how to respond to instructions received from a program. Examples of devices that utilize control units include CPUs and GPUs. A control unit works by receiving input information that it converts into control signals, which are then sent to the central processor. The computer's processor then tells the attached hardware what operations to carry out. The functions that a control unit performs are dependent on the type of CPU, due to the variance of architecture between different manufacturers. The following diagram illustrates how instructions from a program are processed.