What is a micro-instruction? Explain the organisation of control unit. How microinstruction-based control unit work? Explain with the help of a diagram.

A micro-instruction is a low-level instruction that directly controls the operation of the hardware components within a computer. These instructions are part of a microprogram stored in the control memory, which defines the sequence of control signals required to execute a machine-level instruction. Each micro-instruction represents a specific control action that instructs the control unit to perform particular operations like loading registers, performing ALU operations, or reading from memory.

The organization of the control unit consists of two main types: hardwired control and microprogrammed control. A microprogrammed control unit uses a set of microinstructions stored in control memory, while a hardwired control unit generates control signals through combinational logic circuits.

In the case of a microprogrammed control unit, the organization typically includes:

1. Control Memory (CM): A special memory that holds the microprogram (a sequence of micro-instructions) that defines __________ _________ _______ _________ ________ _________ _______ _____ ______ _______ _________.
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