INTRODUCTION TO MICROPEOCESSOR
MICROPROCESSOR TERMINOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The content of the A15-A8 (higher-order address lines) while executing “IN 8-bit port address” instruction are
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irrelevant
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all bits reset (i.e. 00H)
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all bits set (i.e. FFH)
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same as the content of A7-A0
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Explanation:
Detailed explanation-1: -“IN 8-bit port address” is an 8 bit port address. The maximum port range is up to (FF)H. For executing this instruction the high order (A15-A8) port address is duplicated to low order (A7-A0) port address. So high order address bus has same content as low order address bus.
Detailed explanation-2: -As we have already discussed in the class, the 8085 programming model includes six registers, one accumulator, and one flag register, as shown in Figure given below. In addition, it has two 16-bit registers: the stack pointer and the program counter.
Detailed explanation-3: -A word size of an 8085 microprocessor is 8-bit.
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