INTRODUCTION TO MICROPEOCESSOR
MICROPROCESSOR TERMINOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Normally the opcode fetch machine cycle contains ____ states
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4T
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2T
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8T
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3T
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Explanation:
Detailed explanation-1: -The OPCODE-FETCH cycle of CALL has 6 T-states to take care of the decrements of the Stack Pointer. RET instruction requires, 3 machine cycles, OPCODE-FETCH, MEMORY READ, MEMORY READ, even here, the microprocessor’s got to increment the stack pointer twice, as before, to pop.
Detailed explanation-2: -The status signal IO/M(bar) goes low indicating the memory operation and two status signals S1 = 1, S0 = 1 to indicate op-code fetch operation.
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