13.19.1 Overview

There are up to six instances of the serial communication interface (SERCOM) peripheral. Up to five (SERCOM[4:0]) are located in PD1, whereas SERCOM5, present in all device configurations, is always located in power domain PD0.

A SERCOM can be configured to support a number of modes: I²C, SPI, and USART. When SERCOM is configured and enabled, all SERCOM resources will be dedicated to the selected mode.

The SERCOM serial engine consists of a transmitter and receiver, baud-rate generator and address matching functionality. It can use the internal generic clock or an external clock to operate in all sleep modes.