Various communication protocols like UART, I2C, SPI and GPIO lines are available on the MTB to transmit and receive data from the client-side Touch MCUs.
| Communication | Pin Name | HOST MCU Pin |
|---|---|---|
| I2C | SDA | PA08 |
| SCL | PA09 | |
| UART | TXD | PA22 |
| RXD | PA23 | |
| SPI | MISO | PA19 |
| SS | PA18 | |
| SCK | PA17 | |
| MOSI | PA16 | |
| I/O Pin | GPIO 1 | PB10 |
| GPIO 2 | PB12 | |
| GPIO 3 | PB15 | |
| GPIO 4 | PA13 |