What could cause pins in a port to change from values I assign to them?

If you are using the port as an output, make sure that you configure it to be a digital port and not an analog port. Some port pins are multiplexed between the ports and other peripherals and may not be available as I/O if you are using those peripherals.

For more information on how to set up the ports correctly, check the datasheet for the device you are using.

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