31.5.1 I/O Lines

Using the SERCOM I/O lines requires the I/O pins to be configured using the System Configuration registers or PPS.

The SERCOM has four internal pads, PAD[3:0], and the signals from I²C, SPI and USART are routed through these SERCOM pads through a multiplexer. The configuration of the multiplexer is available from the different SERCOM modes.

See I/O Ports and Peripheral Pin Select (PPS) from Related Links.