Reset Sources; Virtual Com Port (Vcp); Leds; Table 7. Vcp Communication - ST STM32 User Manual

External oscillator to PF0 input
The input clock comes from an external oscillator through PF0, CN7 pin 29. The following configuration is needed:
• SB19 ON
• R37 and R38 OFF
• SB20 OFF
HSE not used
PF0 and PF1 are used as GPIOs instead of clocks. The following configuration is needed:
• SB18 and SB19 ON
• R37 and R38 OFF
• SB20 OFF
6.6

Reset sources

The STM32 Nucleo-64 reset signal is active LOW and the reset sources include:
• The reset push‑button (B2)
• The embedded STLINK-V2EC
• The ARDUINO
• The ST morpho connector CN7 pin 14
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
Pin name
PA2
PA3
6.8

LEDs

Five LEDs are available on the STM32 Nucleo-64 board. The five LEDs are located on the top side of the board.
User LED (LD1, LD2)
The user green LED (LD1) is connected to the STM32 I/O PA5 (SB1 ON, default configuration) also used for the
®
ARDUINO D13 function. A transistor is used to drive the LED whatever the MCU 1V8 or 3V3 voltage range. And
the user blue LED (LD2) is connected to the STM32 I/O PC9.
5 V PWR LED (LD3)
The green LED (LD3) indicates that the Nucleo-64 board is powered by a 5 V source, and this source is available
on CN6 pin 5 and CN7 pin 18.
STLINK-V2EC tricolor LED (LD4)
The tricolor (green, orange, and red) LED provides information about STLINK-V2EC communication status (LD4).
For detailed information about the LED, refer to the technical note Overview of ST-LINK derivatives (TN1235).
VBUS_STLK over current LED (LD5)
The red LED is ON when overcurrent is detected on USB VBUS. The LED gives the information that more than
500 mA is requested on VBUS. In this case, it is recommended to supply the board with 5V_EXT, VIN, or
5V_USB.
UM3353 - Rev 1
®
connector CN6 pin 3
Table 7 below to set the USART2 connection to the VCP interface.
Table 7.
Function
USART2TX
USART2RX
VCP communication
Virtual COM port (default configuration)
UM3353
Hardware layout and configuration
R27 ON
R26 ON
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