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A microprogrammed control unit

  1. Is faster than a hard-wired control unit.
  2. Facilitates easy implementation of new instruction.
  3. Is useful when very small programs are to be run.
  4. Usually refers to the control unit of a microprocessor.
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  1. is wrong. Microprogrammed Control Unit (CU) can never be faster than hardwired CU. Microprogrammed CU it has an extra layer on top of hardwired CU and hence can only be slower than hardwired CU.
  2. is a suitable answer as we can add new instruction by changing the content of control memory.
  3. is not correct as when only small programs are there, hardwired control makes more sense.
  4. control unit can also be hardwired, so this is also not correct.

Reference: Slides

Correct Answer: $B$

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B. Facilitates easy implementation of new instruction.
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