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CWedg.1
CWedg.1
Associate II
Jan 18, 2024 8:29 AM UTC
Solved

STM32F070RBT using PLL with HSI RC

Evaluating the STM32F070RBT6 for a project, and using STM32CubeMX V6.10 I am unable to connect the PLL to the HSI RC. It all works ok if I use HSE.

I'm wondering what I'm doing wrong.

 

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KDJEM.1
KDJEM.1Best answer
ST Technical Moderator
Jan 18, 2024 8:52 AM UTC

Hello @CWedg.1 ,

Did you activate the USB?

If yes, note that the HSI cannot be used for the USB clock source. This behavior is mentioned in AN4879 and precisely in section 4.FAQs (frequently asked questions) and also in datasheet section 3.16 Universal serial bus (USB).

KDJEM1_1-1705567891221.png

 

KDJEM1_0-1705567800314.png

 

Thank you.

Kaouthar

 

 

To give better visibility on the answered topics, please click on "Best answer" on the reply which solved your issue or answered your question.
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2 replies

CWedg.1
CWedg.1Author
Associate II
Jan 18, 2024 8:31 AM UTC

I get the message "PLL mux should have HSE as input".

CWedg1_0-1705566700128.png

 

KDJEM.1
KDJEM.1Best answer
ST Technical Moderator
Jan 18, 2024 8:52 AM UTC

Hello @CWedg.1 ,

Did you activate the USB?

If yes, note that the HSI cannot be used for the USB clock source. This behavior is mentioned in AN4879 and precisely in section 4.FAQs (frequently asked questions) and also in datasheet section 3.16 Universal serial bus (USB).

KDJEM1_1-1705567891221.png

 

KDJEM1_0-1705567800314.png

 

Thank you.

Kaouthar

 

 

To give better visibility on the answered topics, please click on "Best answer" on the reply which solved your issue or answered your question.
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