Configuring 32kHz LSE crystal oscillator in CubeMX2

[brjldts]

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

[Saket_Om]

Hello ​@brjldts 

Thank you for bringing this issue to our attention.

I reported this internally.

Internal ticket number: CDM0065171 (This is an internal tracking number and is not accessible or usable by customers).

[brjldts]

Thank you for the reply ​@Saket_Om . Could you confirm that this is a software issue and that the 32.768kHz crystal resonator is supported by this IC?

[TDK]

The 32-pin package doesn’t have an OSC32_OUT pin, so you can only use Bypass.

Not a bug.

[brjldts]

Good catch! This seems to be the answer. Alternate function table confirms that 32-pin packages do not have the OSC32_OUT function