ST STM32H7B3I-EVAL - Interface; Table 23. RS-232 UART Related Jumpers (PA2;PA3: Bootloader); Table 24. RS-232 Connector CN9 with ISP Support; Figure 22. RS-232 Connector CN9

RS-232 UART on PA2/PA3
Important:
Audio I2S6, USB HS, and motor control cannot be used with VCP UART PA2/PA3.
Hardware modifications are listed in Table 23:
Table 23. RS-232 UART related jumpers (PA2/PA3: Bootloader)
Pin name Setting STLINK-V3E VCP (Bootloader)
PA2 (MCU TX)
JP21 / SB42 OFF
JP39 / SB50 ON
PA3 (MCU RX)
JP20 / SB41 OFF
JP40 / SB49 ON
6.6.4 Interface
Figure 22. RS-232 connector CN9
Table 24. RS-232 connector CN9 with ISP support
Pin number Description Pin number Description
1 NC 6 Bootloader_BOOT0
2 RS232_RX (PB15 or PA3) 7 NC
3 RS232_TX (PB14 or PA2) 8 Bootloader_RESET
4 NC 9 NC
5 GND
UM2662
RS-232 UART
UM2662 - Rev 1
page 30/95