6.6 Reset sources
The Discovery kit reset signal is active LOW and the reset sources include:
• The reset push‑button (B1)
• The embedded STLINK-V2EC
• The ARDUINO
®
connector (CN6 pin 3)
• The extension connector (CN7 pin 16)
6.7 Virtual COM port (VCP)
An STM32 serial interface is connected to the STLINK-V2EC debug interface. The user can choose the USART2
interface. Refer to Table 8 below to set the USART2 connection to the VCP interface.
Table 8. VCP communication
Pin name Function
Virtual COM port
(default configuration
Expansion connectors
connection
PA2 USART2 TX U21 ON U21 and R25 OFF
PA3 USART2 RX R33 ON R33 OFF
6.8 LEDs
Six LEDs are available on the STM32U083C-DK Discovery kit. The six LEDs are located on the top side of the
board:
STLINK-V2EC tricolor LED (LD1)
The tricolor (green, orange, and red) LED provides information about STLINK-V2EC communication status (LD1).
For detailed information about the LED, refer to the technical note Overview of ST-LINK derivatives (TN1235).
VBUS_STLK over current LED (LD2)
The red LED is ON when overcurrent is detected on USB V
BUS
. The LED gives the information that more than
500 mA is requested on V
BUS
. In this case, it is recommended to supply the board with E5V, VIN, or in the USB
charger mode.
5V PWR LED (LD6)
The green LED (LD6) indicates that the Discovery kit is powered by a 5 V source, and this source is available on
CN6 pin 5 and CN7 pin 20.
User green LED (LD3), blue LED (LD4), and red LED (LD5)
The user green LED (LD3) is connected to the STM32 I/O PC13.
The user blue LED (LD4) is connected to the STM32 I/O PA5 (R66 ON, default configuration), also used for
ARDUINO
®
D13 function.
The user red LED (LD5) is connected to the STM32 I/O PB2.
A transistor is used to drive the LED whatever the MCU 1V8 or 3V3 voltage range.
UM3292
Hardware layout and configuration
UM3292 - Rev 1
page 15/33
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