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Size of program counter and the instruction register

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A 32-bit microprocessor has 32-bit instructions with 2 fields,
1st field: 1 byte, contains the opcode
2nd field: operand or operand address

How many bits are needed for the program counter and the instruction register?

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Instruction register should be able to hold the instructions completely for further interpretation and execution by CPU, that means the size of instruction register will be 32 bits as microprocessor has 32 bit ...

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