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Associate III
June 18, 2025
Solved

Does STM32C071CBT6 support PLL for external oscillator?

  • June 18, 2025
  • 1 reply
  • 630 views

curiocity_0-1750237282003.png

I am using an 8 MHz external oscillator and was planning to use a PLL to increase the system frequency. However, when I open the Clock Configuration tab in CubeMX, I don’t see any option for a PLL.

I’ve also shared a screenshot of the clock configuration where it’s clear that the PLL option is not available.

So my question is: Does the STM32C071CBT6 microcontroller support PLL with an external oscillator?

Best answer by Andrew Neil

What makes you think the STM32C071CBT6 has a PLL?

There is no mention in the Datasheet

That would explain why CubeMX doesn't show it

1 reply

Andrew Neil
Andrew NeilBest answer
Super User
June 18, 2025

What makes you think the STM32C071CBT6 has a PLL?

There is no mention in the Datasheet

That would explain why CubeMX doesn't show it

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.
Andrew Neil
Super User
June 18, 2025

@Andrew Neil wrote:

There is no mention in the Datasheet


however, there are three mentions in the Reference Manual:

AndrewNeil_0-1750240877106.png

AndrewNeil_1-1750240913072.png

AndrewNeil_2-1750240971265.png

https://www.st.com/resource/en/reference_manual/rm0490-stm32c0-series-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

via: https://www.st.com/en/microcontrollers-microprocessors/stm32c071cb.html#documentation

 

@STTwo-32 These look like copy-paste errors in the RM ?

 

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.
STTwo-32
Technical Moderator
June 19, 2025

Hello @Andrew Neil 

I've escalated this to the doc team for review (under internal ticket number 212567).

Best Regards.

STTwo-32