Control Unit

The Control Unit can be thought of as the brain of the CPU itself. It controls based on the instructions it decodes, how other parts of the CPU and in turn, rest of the computer systems should work in order that the instruction gets executed in a correct manner. There are two types of control units, the first type is called hardwired control unit. Hardwired control units are constructed using digital circuits and once formed cannont be changed. The other type of control unit is microprogrammed control unit. A microprogrammed control unit itself decodes and execute instructions by means of executing microprograms.