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  • pria123
    pria123

    Member • Oct 11, 2008

    8253 program

    hey guys i've got this program to calculate time delay using 8253. pls help me with the codings. i don't get the logic.

    MVI A,30H
    OUT 0CEH
    MVI A,05H
    OUT 0C8H
    MVI A,OOH
    OUT 0C8H
    HLT

    pls help me guys!!!
    thanks
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  • binu_ji

    Member • Oct 28, 2008

    MVI A,30H
    OUT 0CEH
    Here 30H is the value which is stored in the control word of 8253.
    [​IMG]
    For control word operation please check the above figure,
    OUT 0C8H
    here 0C8h may be address of some device.
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