ST MB1801B-01 - Clock Sources; HSE Clock References; LSE Clock References; Reset Sources

UM3301 - Rev 3 page 11/26
UM3301-M
6.3 Clock sources
7.2.1 HSE clock references
The accuracy of the high‑speed clock (HSE) of the MCU RF board is committed to a 32 MHz crystal oscillator.
The HSE oscillator is trimmed during board manufacturing.
7.2.2 LSE clock references
The accuracy of the low‑speed clock (LSE) of the MCU RF board is committed to a 32.768 kHz crystal oscillator.
6.4 Reset sources
The reset signal of MB1803B-01 is active LOW. The internal PU forces the RST signal to a high level.
The Hardware reset is accessible on pin 12 of CN1 connector.