1.1 UART I²C and Boot Pin Configurations

Table 1-1. Port Pin, USART and TWIHS Instance for UART and I²C
Protocol	Port Pin Configuration	USART and TWIHS Instance
UART	PB01 - TX - USART0/TXD0 PB00 - RX - USART0/RXD0	USART 0
I²C	PA03 - SDA - TWIHS0/SDA - External Pull-up required PA04 - SCL - TWIHS0/SCL - External Pull-up required	TWIHS 0
Boot pin	PA24 - GPIO - Input - Pull-up enabled	-

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