33.5.1 I/O Lines

The ADC samples the voltage present on the I/O pins. Typically, the I/O pin output buffer should be disabled to prevent interference with the input signal. This is done by writing the corresponding Port Data Direction bit in the Data Direction register (DIR.DIR) to ‘0’, which is the default setting for the I/O pins. Additionally, to minimize switching noise from the I/O pin’s input buffer, it is recommended to disable it by writing the Input Buffer Enable to ‘0’ in the corresponding Pin Configuration register (PINCFG.INEN). For more details, refer to the PORT – I/O Pin Controller chapter.

Refer to the Pinout and Multiplexing section in the Pinout chapter and the PORT – I/O Pin Controller chapter for details.