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  1. In 8085 microprocessor based system running at 3 MHz clock frequency what should be the minimum pulse width of the INTR signal, so that it is recognized successfully?

    2. A.
    0.33 μs
    B.
    0.666 μs
    C.
    5.8 μs
    D.
    none of these

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    Answer : Option C

    Explanation :

    T = x 106 = 0.333 μs

    8085 checks INTR, one clock period before the last T-state of an instruction cycle. In 8085, CALL instruction requires 18 T-states.

    ∴ INTR pulse should be high at least for 17.5 T-states

    i.e. for 17.5 x 0.33 x 10-6 = 5.8 μs long.

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