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3 is the answer of this question, 1 cycle for instruction fetch and 2 cycles for stack operations. return address is required to continue with main program after finishing the execution of subroutine.
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1 votes
The RET instruction needs 3 machine cycles. One to fetch and decode the instruction (4 T states), and two more machine cycles (that is, 2*3 = 6 T states) to read two bytes from the stack

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