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STM32F401 USB without HSE

Question asked by Gordon Williams on Mar 5, 2014
Latest reply on Mar 7, 2014 by knik
I'm looking at making a device with the STM32F401, and I'm wondering if USB on it can function without a HSE crystal?

The clock diagrams seem to imply that PLL48 can work off of HSI, but the reference implies that USB needs HSE to work.

I'm planning on adding a LSE for the RTC, so I could probably automatically calibrate the HSI relatively easily.