Solved
No OSC_IN on STM32H503KB (32-pin QFN)
The 32-pin package doesn't seem to have any kind of external clock input at all, and the device does not feature "crystal-less USB". How do we provide a stable clock for USB then?
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Hello @maxter and welcome to the ST Community
For the USB, you can use the hsi48_ker_ck according to the table 67 and paragraph 10.4.4 of the RM0492 Rev3. and according to the paragraph 3.10 of the DS14053 Rev4.
Best Regards.
STTwo-32
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