Microprogrammed Control Unit (MCU) is a Control Unit of a Computer. The design of MCU is Program based. Such a Control Unit is a programmed one. The Programming activity that is deployed is called Microprogramming. A Microprogram is designed performing Microprogramming action. In fact, Microprogramming is the task undertaken for designing and building the Control Unit of a Computer . Such a Control Unit is called Microprogrammed Control Unit (MCU). For building the MCU, an additional memory called Microprogram Store is used. MCU is responsible for controlling the activities inside a Computer System. Generally, the directives issued to the Computer System at the Hardware level are controlled and coordinated by the MCU. Hardware level activities performed using MCU affect data processing facilitated by a Computer. MCU performs like a conventional Control Unit. The difference is that, instead of being hardwired, MCU is designed to be programmed (or Microprogrammed ...