ST STM32MP157F-EV1 - RS-232 Port; RS-232 Interface HW Configuration; RS-232 I;O Usage Restrictions

6.21.1 RS-232 interface
The RS-232 transceiver MB1262/U12 supply is 3.3 V. The RS-232 interface is connected to the
STM32MP157FAA1 UART4 that is shared exclusively with the USB Micro-B ST-LINK/V2-1 VCP as described in
Table 33.
Table 33. HW configuration for the RS-232 interface
Jumpers I/O Setting
Configuration
(1)
MB1263/JP4 UART4_TX
JP4[1-2] Connected to RS-232 CN12
JP4[2-3] Connected to ST-LINK/V2-1 VCP RX
MB1263/JP5 UART4_RX
JP5[1-2] Connected to RS-232 CN12
JP5[2-3] Connected to ST-LINK/V2-1 VCP TX
1. Default configuration in bold
Figure 18. HW configuration for the RS-232 interface
Figure 19. RS-232 connector pinout MB1262/CN12
Table 34 details the RS-232 connector pinout MB1262/CN12
Table 34. RS-232 connector pinout MB1262/CN12
Board function Pin Pin Board function
NC 1 6 DSR
RXD 2 7 NC
TXD 3 8 CTS
UM2648
RS-232 port
UM2648 - Rev 1
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