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# 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 | PC00 - TX - SERCOM0-PAD[0] PC01 - RX - SERCOM0-PAD[1] | SERCOM 0 (Can be accessed only in the Secure region)
I2C | PD01 - SDA - SERCOM1-PAD0 - External Pull-up required PD00 - SCL - SERCOM1-PAD1 - External Pull-up required | SERCOM 1 (Can be accessed only in the Secure region)
Boot pin | PA00 - 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`) - `1000-000x` (where x = 0 for write, 1 for read). Address is fixed and not programmable through any hardware setting.