63.1.1 UART I2C and Boot Pin Configurations

Table 63-1. Port Pin, USART and TWIHS Instance for UART and I2C
ProtocolPort Pin ConfigurationUSART and TWIHS Instance
UARTPB01 - TX - USART0/TXD0

PB00 - RX - USART0/RXD0

USART 0
I2CPA03 - SDA - TWIHS0/SDA - External Pull-up required

PA04 - SCL - TWIHS0/SCL - External Pull-up required

TWIHS 0
Boot pinPA24 - GPIO - Input - Pull-up enabled-
Table 63-2. UART and I2C Communication Configurations
ProtocolCommunication Parameters
UART115200 baud, 8-bit, Even parity, 1 Stop bit
I2CUp to 400 kHz speed.

I2C client 7-bit address (0x40).

Address is fixed and not programmable through any hardware setting.