Differentiate between hardwired control unit and microprogrammed control unit

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The difference between Hardwired and Microprogrammed Control Unit are

Hardwired Control Unit Microprogrammed Control Unit
Hardwired control unit generates the control signals needed for the processor using logic circuits Microprogrammed control unit generates the control signals with the help of micro instructions stored in control memory
Hardwired control unit is faster when compared to microprogrammed control unit as the required control signals are generated with the help of hardwires This is slower than the other as micro instructions are used for generating signals here
Difficult to modify as the control signals that need to be generated are hard wired Easy to modify as the modification need to be done only at the instruction level
More costlier as everything has to be realized in terms of logic gates Less costlier than hardwired control as only micro instructions are used for generating control signals
It cannot handle complex instructions as the circuit design for it becomes complex It can handle complex instructions
Only limited number of instructions are used due to the hardware implementation Control signals for many instructions can be generated
Used in computer that makes use of Reduced Instruction Set Computers(RISC) Used in computer that makes use of Complex Instruction Set Computers(CISC)
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