Hardware Configuration; Rs-232 Uart; Description; Operating Voltage - ST STM32H7B3I-EVAL User Manual

6.5.3

Hardware configuration

VCP ST-LINK UART on PB14/PB15 (Default configuration)
PB14 (MCU TX)
PB15 (MCU RX)
1. The default setting is in bold.
VCP ST-LINK RS-232 UART on PA2/PA3
Important: Audio I2S6, USB HS, and motor control cannot be used with VCP UART PA2/PA3.
PA2 (MCU TX)
PA3 (MCU RX)
6.6

RS-232 UART

6.6.1

Description

RS-232 communication is supported by D-type 9-pins RS-232 connector CN9, which is connected to PB14/PB15
(Default configuration) or PA2/PA3 (Compatible with bootloader) pins of STM32H7B3LIH6QU on the
STM32H7B3I-EVAL Evaluation board through ST3241EBPR RS-232 transceiver U9.
The Bootloader_RESET and Bootloader_BOOT0 signals are added on RS-232 connector CN9 for ISP support.
6.6.2

Operating voltage

The STM32H7B3LIH6QU UART interface can only be at 3.3 V on this board.
6.6.3 Hardware configuration
RS-232 UART on PB14/PB15 (Default configuration)
Hardware modifications are listed in
PB14 (MCU TX)
PB15 (MCU RX)
1. The default setting is in bold.
UM2662 - Rev 1
Table 20. STLINK-V3E VCP UART (PB14/P15: Default configuration)
Pin name
Table 21. STLINK-V3E VCP UART (PA2/PA3: Compatible with bootloader)
Pin name
Table 22:
Table 22. RS-232 UART (PB14/P15: Default configuration)
Pin name
Setting
JP21 / SB42
JP39
JP20 / SB41
JP40
Setting
JP21
JP39 / SB42
JP20
JP40 / SB41
Setting
JP21 / SB50
JP39 / SB42
JP20 / SB49
JP40 / SB41
UM2662
RS-232 UART
STLINK-V3E VCP (1)
ON
OFF
ON
OFF
STLINK-V3E VCP (Bootloader)
OFF
ON
OFF
ON
(1)
STLINK-V3E VCP
ON
OFF
ON
OFF
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