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MCB1700 Lpc1768 ports P0.23, P0.24

Sebastian Völkel

I have the following problem, P0.23 and P0.24 are Select as AD0.0 and AD0.1, when I read of the channels, they have the same Voltage as AD0.2 on P0.25, but nothing stands in the schematics of
P0.23 and P0.24, they are not connected or am I wrong?

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  • 0 in reply to Sebastian Völkel

    Don't try to measure voltages for unconnected pins.

    When used as digital inputs, they normally have a weak pull-up enabled (unless you disable the pull-up or switches it to pull-down).

    But what holds the pins at a known state when you change them to ADC inputs, if you haven't connected any external signals to the pins?

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  • 0 in reply to Sebastian Völkel

    Don't try to measure voltages for unconnected pins.

    When used as digital inputs, they normally have a weak pull-up enabled (unless you disable the pull-up or switches it to pull-down).

    But what holds the pins at a known state when you change them to ADC inputs, if you haven't connected any external signals to the pins?

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