Question: Sometime during instruction interpretation, it is necessary to update the contents of the program counter (PC) to point to the next instruction. In machines, where

Sometime during instruction interpretation, it is necessary to update the contents

Sometime during instruction interpretation, it is necessary to update the contents of the program counter (PC) to point to the next instruction. In machines, where the PC is part of the general purpose registers there are often specific constraints on when the PC is updated. Please explain. In particular, explain when it is necessary to have it updated before operand decode and when it is only important to be updated before the next instruction is to be fetched

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