The Control Unit (CU), can be understood or called as Control System or Central Controller
CU is a component of a computer's central processing unit (CPU).
It directs the operation of the processor or the flow of data between the CPU and the other devices.
It tells the computer's memory, arithmetic and logic unit and input and output devices how to respond to the instructions that have been sent to the processor.
CU manages the computer's various components as follows :
- It reads and interprets (decodes) the program instructions.
- It then transforms the program instructions into control signals that further activate other parts of the computer.
- In advanced computers, CU may change the order of execution of some instructions to improve performance.
In some more complex CPU designs, there is another yet smaller computer called a Microsequencer, which runs a microcode program that causes all of the events like reading and interpretations etc to happen.
