Computer System Overview — Question 4

Control Unit is responsible for controlling and supervising the processing. It performs the following functions:

1. It controls and guides the interpretation, flow and manipulation of all data and information.
2. It sends control signals until the required operations are done properly by ALU and memory.
3. It fetches the program instructions from the memory unit one by one. The instructions are decoded and executed one after the other.
4. After an instruction is executed, it sends a signal to memory to send the next instruction in sequence to CU.
5. It controls the flow of data from input devices to memory and from memory to output devices.

Yes, we can call control unit the control centre of computer system because it acts as a supervisor by controlling and guiding all the other components of the computer system as well as the operations taking place.