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Question

How many bit can accommodate instruction register _____________.

A
8 bit
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B
16 bit
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C
32 bit
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D
4 bit
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Solution

The correct option is B 16 bit

16 bit can accommodate instruction register.

A 16-bit integer can store 2^16 distinct values. In an unsigned representation, these values are the integers between 0 and 65,535; using two's complement, possible values range from −32,768 to 32,767. Hence, a processor with 16-bit memory addresses can directly access 64 KB of byte-addressable memory.

An instruction register (IR) is the part of a CPU's control unit that holds the instruction currently being executed or decoded. Each instruction register cell comprises a shift-register flip-flop and a parallel output latch. The shift registers hold the instruction bits moving through the instruction register.


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