The B1 User button is a way to interact with software. This is a selection key, active high, which is mapped on a
WKUP PIO (PC13).
A touch panel is also available on the display, and a ToF sensor is on the main board to interact with software.
12.12 Reset button and reset function
The B2 reset button can activate the NRST reset function for all connected onboard devices.
The Hardware system reset is managed by the STM32U5A9NJH6Q microcontroller and is available on PG10-
NRST pin. NRST signal is tied to GND during reset while it has a permanent internal pull-up tied to VDD_MCU.
The NRST signal is connected to these peripherals: the Octo‑SPI flash memory, expansion connector (CN9),
debugging connector (CN11), TAG connector (CN3), and STLINK-V3E (through JP5). The STLINK-V3E can
activate the NRST reset function if the JP5 jumper is ON and JP6 OFF (default settings).
12.13 Buttons and LEDs function
Table 19 summarizes the different buttons and LEDs of the STM32U5A9J-DK Discovery kit and their function:
Table 19. Buttons and LEDs
Reference Color Function Comment
B1 Blue USER button (USER_Button) PC13
B2 Black RESET button (T_NRST) Reset the board, PG10
LD1
(1)
Green VDD/3V3 LED
Lit when VDD and 3V3 are
present (VDD_MCU = VDD if
JP2/JP3 populated)
LD2 Green 5V power LED Lit when 5V is ON
LD3 Green USER_GREEN LED LED_GREEN, PE0
LD4 Red USER_RED LED LED_RED, PE1
LD5 Red ST-LINK Overcurrent LED (OVC)
Lit when STLK overcurrent
detected
LD6 Red, green, or orange ST-LINK COM LED Lit according to ST-LINK status
LD7 Green USBC Power LED
Lit when USB Type-C
®
is
connected and powered from
source
1. LD1 function is not populated by default.
UM2967
Reset button and reset function
UM2967 - Rev 1
page 36/68
To Next Page
Loading...
Need help?
General
