Changing several o/p pins at the same time

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  1. - 1st August 2008, 20:28 #3
    Darrel Taylor's Avatar
    Darrel Taylor
    Darrel Taylor is offline Fanatical Contributor
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    Read-Modify-Write, just like the chip does it when setting a single bit.

    Code:
    PORTB = (PORTB & %11110000) | MyNibble
    This reads the Port, saves the bits you don't want to change, then adds the new bits and writes it back to the Port.

    If there's any possibilty of bits above 3 being set in the MyNibble variable, you should use this instead ...
    Code:
    PORTB = (PORTB & %11110000) | (MyNibble & %00001111)
    <br>
    Last edited by Darrel Taylor; - 1st August 2008 at 20:30. Reason: Rat's, ya beat me ski. :(
    DT
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