34.1 Overview

The Inter-Integrated Circuit (I²C) interface is one of the available modes in the Serial Communication Interface (SERCOM).

The I²C interface uses the SERCOM transmitter and receiver configured as shown in Figure 34-1. Labels in capital letters are registers accessible by the CPU, while lowercase labels are internal to the SERCOM.

A SERCOM instance can be configured to be either an I²C Host or an I²C Client. Both Host and Client have an interface containing a Shift register, a transmit buffer and a receive buffer. In addition, the I²C Host uses the SERCOM baud-rate generator, while the I²C Client uses the SERCOM address match logic.