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AMC7834: GPIO Utilization

Tom Penick2
Prodigy 10 points
Part Number: AMC7834

I have read the AMC7834 data sheet and the AMC7834EVM user guide and I see how to set the register to set up GPIO1 - GPIO4 as inputs or outputs.  What I do not find is how to set up the functionality of these I/O.  How are they utilized?

  • 0
    TI__Guru 53623 points

    Hi Tom,

    The GPIO is controlled with a single register.  The outputs are open-drain, mean they can be held low, or are high impedance.  If you want to use the pin as an output, you write the GPIO register to either 0 or 1.  When 0, the pin held to ground.  When 1, it is high-z.  It requires an external pull up resistor to actually go to logic 1.  

    If you want to use the pin as an input, you just write 1 to the register and omit the pull-up resistor.  When read, the register will reflect the current polarity of the pin.

    Thanks,

    Paul