The control unit of the central processing unit handles and incorporates the operations of the computer. And to execute any instruction, the control unit needs to generate the required control signal to be in an accurate sequence. In this context, we have two terms used to generate proper sequence: Hardwired control unit and Microprogrammed control unit. Let’s find out some major differences between the Hardwired control unit and the Micro-programmed control unit.
What is a Hardwired Control Unit?
A hardwired control is an approach to generating control signals utilising Finite State Machines (FSM) appropriately.
What is a Microprogrammed Control Unit?
A Microprogrammed control unit generates the control signals to retrieve and execute instructions. This control unit generates sequencing via microinstructions.
Difference between Hardwired and Microprogrammed Control Unit
| S.No. | Hardwired Control Unit | Microprogrammed Control Unit |
|---|---|---|
| 1. | The hardwired control unit induces the control signals required for the processor. | The microprogrammed control unit induces the control signals through microinstructions. |
| 2. | Hardwired control unit is quicker than a microprogrammed control unit. | Microprogrammed control unit is slower than a hardwired control unit. |
| 3. | It is hard to modify. | It is easy to modify. |
| 4. | It is more expensive as compared to the microprogrammed control unit. | It is affordable as compared to the hardwired control unit. |
| 5. | It faces difficulty in managing the complex instructions because the design of the circuit is also complex. | It can easily manage complex instructions. |
| 6. | It can use limited instructions. | It can generate control signals for many instructions. |
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