28.5.1 I/O Lines

Using the SERCOM’s I/O lines requires the I/O pins to be configured.

The SERCOM has four internal pads, PAD[3:0], and the signals from I²C, SPI and USART are routed through these pads via a multiplexer. The configuration of the multiplexer is determined by the selected SERCOM mode

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