a little help with keypad on 18f4520 please

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  1. - 20th November 2009, 19:08 #8
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    aratti
    aratti is offline Senior Member
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    Adding OPTION_REG.7 = 0 ' Enable PORTB pull-ups
    Shows a compile error in Microstudio
    Does not compile
    I am using an 18F4520
    Dennis not all pic has the internal pullup, could be that your mcu has not pullup.
    (Check the datasheet).



    Since you will need the pullups (otherwise the keypad will not work), so add four external 10K resistors.

    Al.

    Edit:

    Gusse has read the datasheet for you: Replace OPTION_REG.7 = 0 with INTCON2.7 = 0
    Last edited by aratti; - 20th November 2009 at 19:16.
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