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.
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
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Rev 1
page 30/95