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Crystal accuracy for USB

Question asked by john.john.002 on Jul 22, 2016
Latest reply on Jul 22, 2016 by waclawek.jan
What ppm accuracy is needed for STM32F103RB as full-speed (12Mbits/s) device?

Is RC HSI (a few percent error) not accurate enough for STM32F103RB as USB device?

For STM32F401RE, do host or OTG modes require higher accuracy than device mode? 

Does Device 'listen to and derive' clocking speed from Host/OTG and requires less accurate crystal?