7.3 Clock sources
7.3.1 HSE clock reference
The high-speed clock (HSE) of the STM32WB5MM-DK Discovery kit is embedded on the STM32W5MMG
module. It uses a 32 MHz crystal oscillator. The HSE oscillator is trimmed during module manufacturing.
7.3.2 LSE clock reference
The low‑speed clock (LSE) of the STM32WB5MM-DK Discovery kit is embedded on the STM32W5MMG module.
It uses a 32.768 kHz crystal oscillator.
7.4 Reset sources
The reset signal of STM32W5MMG is active LOW. The internal pull-up resistor forces the RST signal to a HIGH
level.
The sources of reset are the following:
• B3 push‑button reset (small black button)
• Embedded ST-LINK/V2-1
• Pin 3 of the CN2 ARDUINO
®
connector, reset from the ARDUINO
®
board
• Pin 10 of the CN7 TAG-Connect (TAG10) connector
UM2825
Clock sources
UM2825 - Rev 1
page 15/42
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