50.1.1 UART I2C and Boot Pin Configurations

Table 50-1. Port Pin and SERCOM instance for UART and I2C
Protocol Port Pin Configuration SERCOM Instance
UART PA18 - TX - SERCOM1/PAD2

PA19 - RX - SERCOM1/PAD3

 SERCOM 1
I2C PA22 - SDA - SERCOM3/PAD0 - External Pull-up required

PA23 - SCL - SERCOM3/PAD1 - External Pull-up required

 SERCOM 3
Boot pin PA27 - GPIO - Input - Pull-up enabled -
Table 50-2. UART and I2C communication configurations
Protocol Communication Parameters
UART 115200 baud, 8-bit, Even parity, 1 Stop bit
I2C Up to 400 kHz speed.

I2C client 7-bit address (0x40) - 1000-000x (where x = 0 for write, 1 for read).

Address is fixed and not programmable through any hardware setting.