STM32N6570-DK HSE Input Frequency

mhd0425 · ‎2026-01-26

Hello,

I am currently evaluating the STM32N6570-DK and am seeking clarification regarding a discrepancy I’ve encountered.

I can confirm that there is a 48MHz crystal on board for the HSE. However, the default CubeMX projects generated by the board selector, as well as other example projects I have reviewed, all configure the input frequency to 24MHz.

Could you please clarify what the correct input frequency for the HSE should be on this discovery kit?

Thank you for your assistance.

Simon V. · ‎2026-01-26

Hello,

Can you please share which projects please ? I performed a quick check on template project for example and HSE frequency was 48MHz.

Please note from product reference manual HSE peripheral has an optional DIV2 output.

Regards,

Simon

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Andrew Neil · ‎2026-01-26

What do the board User Manual and Schematics say ?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

mfgkw · ‎2026-01-26

The schematics tells 48 MHz: https://www.st.com/resource/en/schematic_pack/mb1939-n6570-c02-schematic.pdf

(In doubt I would use what is printed on the crystal on my board...)

TDK · ‎2026-01-26

A default project created on the board for me shows 24 MHz, not 48 MHz. Maybe templates are correct, maybe not. The result is still wrong.

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mhd0425 · ‎2026-01-26

@Simon V. The projects are from Infineon AIROC https://github.com/Infineon/AIROC-Wi-Fi-Bluetooth-STM32 but also when I generate a project from board selector. CubeMX 6.16.1 and MPU package for STM32N6 Series version 1.3.0.

I checked the crystal under a microscope. It is labeled 48MHz.

@TDK That is what I see too.