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HL1
Associate
Jan 31, 2025 3:43 AM UTC
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STM32f411 crystal

Hi,

I am new with stm32F411 mcu, and i have a question. if i want to use RTC features, do i need to add an external 32.768kHz xtal ?

Thanks.

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TDK
TDKBest answer
Jan 31, 2025 3:56 AM UTC

No, technically. You can use the internal LSI or the divided down HSE clock. However, the LSI clock is not very accurate and the HSE clock uses a lot of power.

But typically, an LSE crystal is used as it allows the chip to go into a very low power state while still running the RTC.

TDK_0-1738295774157.png

 

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TDK
TDKBest answer
Jan 31, 2025 3:56 AM UTC

No, technically. You can use the internal LSI or the divided down HSE clock. However, the LSI clock is not very accurate and the HSE clock uses a lot of power.

But typically, an LSE crystal is used as it allows the chip to go into a very low power state while still running the RTC.

TDK_0-1738295774157.png

 

"If you feel a post has answered your question, please click ""Accept as Solution""."
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