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CWedg.1
CWedg.1
Associate II
January 18, 2024
Solved

STM32F070RBT using PLL with HSI RC

  • January 18, 2024
  • 2 replies
  • 1738 views

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.

 

Best answer by KDJEM.1

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

 

 

2 replies

CWedg.1
CWedg.1Author
Associate II
January 18, 2024

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

CWedg1_0-1705566700128.png

 

KDJEM.1
KDJEM.1Answer
Technical Moderator
January 18, 2024

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

 

 

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