STM32F103C8T6 Clock Configuration - STM32CubeIDE

[chriskuku]

I'm wondering why I can't configure 72MHz clock in the Clock configuration panel in CubeIDE

for the STM32F103C8T6 (blue pill) board.

From my understanding it has an 8 MHz quartz connected to pins 5,6 and choosing these pins as RCC OSC_IN/OUT doesn't seem to allow me to choose the external HSE clock and switch to PLL internally.

[chriskuku · Accepted solution]

I solved it. Had to enable external HSE crystal osc. in the RCC setting first. Then the HSE option got avaiable in the clock configuration panel.

[Foued_KH]

Hello @chriskuku​,

If u want to choose the external HSE clock, I recommend you try to:

• Enable the HSE as: Crystal/Ceramic Resonator.

Now you can manage your clock tree: choose the external HSE clock and switch to PLL internally.

Hope my answer helped you!

When your question is answered, please close this topic by choosing Select as Best.

This will help other users find that answer faster.

Foued

[chriskuku]

Thank you, Foued, for giving more details. But I posted the solution already a few minutes before your post. Thanks anyway.

[Foued_KH]

@chriskuku​ You are welcome 😁

Foued