1.1 UART I²C and Boot Pin Configurations

Table 1-1. Port Pin and SERCOM Instance for UART and I²C
Protocol	Port Pin Configuration	SERCOM Instance
UART	PA04 - TX - SERCOM0/PAD0 PA05 - RX - SERCOM0/PAD1	SERCOM 0 (Can be accessed only in the Secure region for TrustZone variants)
I²C	PA22 - SDA - SERCOM2/PAD0 - External Pull-up required PA23 - SCL - SERCOM2/PAD1 - External Pull-up required	SERCOM 2 (Can be accessed only in the Secure region for TrustZone variants)
Boot pin	PA02 - GPIO - Input - Pull-up enabled (Can be accessed only in the Secure region for TrustZone variants)	-

Table 1-2. 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)`. Address is fixed and not programmable through any hardware setting.

1.1 UART I2C and Boot Pin Configurations