UM2407 Rev 3 25/49
UM2407 Hardware layout and configuration
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6.5.2 LSE clock (low-speed external clock) - 32.768 kHz
There are three ways to configure the pins corresponding to the low-speed clock (LSE):
• On-board oscillator (default): X2 crystal. Refer to the application note Oscillator
design guide for STM8AF/AL/S and STM32 microcontrollers (AN2867) for oscillator
design guide for STM32H7 series microcontrollers. The configuration must be:
– SB40 and SB41 OFF
– R38 and R39 ON
• Oscillator from external PC14: From an external oscillator through pin 25 of the CN11
connector. The configuration must be:
– SB40 and SB41 ON
– R38 and R39 OFF
• LSE not used: PC14 and PC15 are used as GPIOs instead of the low-speed clock.
The configuration must be:
– SB40 and SB41 ON
– R38 and R39 OFF
6.6 Board functions
6.6.1 LEDs
User LD1: A green user LED is connected to the STM32H7 I/O PB0 (SB39 ON and SB47
OFF) or PA5 (SB47 ON and SB39 OFF) corresponding to the ST Zio D13.
User LD2: A yellow user LED is connected to PE1.
User LD3: A red user LED is connected to PB14.
These user LEDs are on when the I/O is HIGH value, and are off when the I/O is LOW.
COM LD4: The tricolor (green, orange, and red) LED (LD4) provides information about ST-
LINK communication status. LD4 default color is red. LD4 turns to green to indicate that
communication is in progress between the PC and the STLINK-V3E, with the following
setup:
• Slow blinking red/OFF at power-on before USB initialization
• Fast blinking red/OFF after the first correct communication between the PC and
STLINK-V3E (enumeration)
• Red LED ON when the initialization between the PC and STLINK-V3E is complete
• Green LED ON after a successful target communication initialization
• Blinking red/green during communication with the target
• Green ON communication finished and successful
• Orange ON communication failure
PWR LD5: The green LED (LD5) indicates that the STM32H7 part is powered. The +5 V
power is available on CN8 pin 9 and CN11 pin 18.
USB power fault LD6: The red LED (LD6) indicates that the board power consumption on
USB exceeds 500
mA, consequently, the user must power the board using an external
power supply.
USB FS LD7 and LD8: Refer to USB OTG_FS.
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