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August 17, 2026
Question

Configuring 32kHz LSE crystal oscillator in CubeMX2

  • August 17, 2026
  • 0 replies
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Hi,

I am an electrical engineer designing a circuit for an STM32C532KCU6 microcontroller, and I am using CubeMX2 version 1.1.1 to validate the clock tree.

The datasheet offers a 32.768kHz crystal resonator as a source for the LSE.

However, in MX2, the configuration screen for the RCC does not allow the LSE to use crystal/ceramic resonator as a source. 

In addition, the RTC configuration screen shows an error regarding its LSE source.



Could you confirm that 32.768KHz crystal resonator is supported by the LSE for this microcontroller, or do we have to use an external oscillator or RC? 

Thanks,
Benny