What is the use of instruction decoder?

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Instruction decoder takes bits stored in the instruction register and decodes it and tells to CPU what it need to do for it and enable the components for the operation.

Simply, instruction decoder is like a dictionary. It tells the meaning of the instruction.
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How do you use the decoder to decode messages on Spy Island?

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Difference between Instruction register and instruction decoder?

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Where can we use decoder?

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Where do you use Decoders?

Decoders are just an accumulation of rationale doors which areorchestrated specifically in order to breakdown any blend of inputsto an arrangement of terms that are good to go