A microprogrammed control unit : 

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  1. is faster than hardwired control unit
  2. allows easy implementation of new instructions 
  3. is useful when small programs are to be run 
  4. none of the options

Answer (Detailed Solution Below)

Option 2 : allows easy implementation of new instructions 
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The correct answer is 2) allows easy implementation of new instructions.

key-point-image Key Points
  • A microprogrammed control unit allows easy implementation of new instructions.
    • Microprogramming involves storing control information in a memory called control memory.
    • When a new instruction is needed, it can be added to the control memory without changing the hardware.
    • This makes the control unit highly flexible and adaptable to new instructions or changes in instruction set architecture.
    • Unlike a hardwired control unit, which requires physical changes to the wiring and circuitry, a microprogrammed control unit only requires updates to the control memory.
additional-information-image Additional Information
  • Microprogrammed control units are typically used in complex instruction set computers (CISC) due to their ability to handle complex instructions efficiently.
  • They provide a systematic and organized approach to control unit design.
  • However, microprogrammed control units are generally slower than hardwired control units because of the additional memory access time required to fetch microinstructions.
  • Despite being slower, their flexibility and ease of updating make them suitable for many applications.
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