Central Processing Unit Q.3

0. Which of the following must be true for the RFE (Return from Exception) instruction on a general purpose processor.
1. It must be a trap instruction
2. It must be a privileged instruction
3. An exception can not be allowed to occur during execution of an RFE instruction.

Answer
Comment
Array

Option : D
Explanation : For any exception, while executing RFE, no exception is alllowed (no interrupts). I t is a priveleged instruction, as soon as exception occurs RFE is called (executed).

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