8.3 Drivers
Before connecting the Discovery board to a Windows PC via USB, the user must install a driver for the STLINK-
V3E (not required for Windows 10). It is available on the www.st.com website.
In case the Discovery kit is connected to the PC before the driver is installed, some Discovery board interfaces
might be declared as Unknown in the PC device manager. In this case, the user must install or update the driver
files, and update the driver of the connected device from the device manager as shown in Figure 14.
Note: Prefer using the USB Composite Device handle for a full recovery.
Figure 14. USB composite device
Note: 37xx:
• 374E for STLINK-V3E without bridges functions
• 374F for STLINK-V3E with bridges functions
8.4
STLINK-V3E VCP configuration
STLINK-V3E supports the Virtual COM port (VCP) by default.
Communication between the target MCU and ST-LINK MCU is enabled on USART1 (PA9/PA10). The Virtual
COM port settings are 115200 bps, 8-bit data, no parity, 1 stop bit, and no flow control.
8.5
STLINK-V3E I/O interface
Here are the interface signals between STM32U5A9NJ MCU and STLINK-V3E:
Table 6. STLINK-V3E I/O interface
PIO
Configuration
PA14 SWCLK (T.SWCLK/T.JTCK)
PA13 SWDIO (T.SWDIO/T.JTMS)
PB3 SWO (T.SWO/T.JTDO)
PA15 JTDI (T.JTDI)
NRST NRST (NRST)
PA9 VCP_TX (T.VCP_TX) – USART1_TX
PA10 VCP_RX (T.VCP_RX) – USART1_RX
PH0 MCO (T.MCO) – not used
UM2967
Drivers
UM2967 - Rev 1
page 17/68
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