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  1. In 8085 microprocessor system, what will be the total delay provided by the following loop.
    MVI A, 11H
    LXI B, 12FFH
    Delay: DCX B
    XTHL
    NOP
    XRA B
    JNZ Delay
    where system clock is operating at 3 MHz.

    2. A.
    3.154 msec
    B.
    3.514 msec
    C.
    2.644 msec
    D.
    3.166 msec

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    Answer : Option A

    Explanation :

    8085 T-States

    MVI A, 11H 7

    LX1 B, 12FFH 10

    Delay: DCX B 6

    XTHL 16

    NOP 4

    XRA B 4

    JNZ Delay 10/7

    Total T states = 7 + 10 + 255(6 + 16 + 4 + 4 + 7) + 10 = 9462

    Therefore total delay introduced = = 3.154 m sec.

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