User manual

RS232
The RS232 port can be used for communication when in bootloader mode. To enter bootloader mode you
need to close RST_E and BOOT0_E jumpers. Note that the default position of those jumpers is closed,
e.g. bootloader mode disabled.
Pin # Signal name
1 NC
2 T1OUT
3 R1IN
4 NC
5 GND
6 NC
7 CTS
8 RTS
9 NC
UEXT
Pin # Signal name
1 3.3V
2 GND
3 USART2_TX
4 USART2_RX
5 I2C1_SCL
6 I2C1_SDA
7 SPI3_MISO
8 SPI3_MOSI
9 SPI3_SCK
10 CS_UEXT