Hi Bolt, [quote userid="549268" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1491965/am2434-tiny-usb-full-speed-mode-question/5761307#5761307"]Could you provide the physical meaning of some related register values so that we can try to debug the issue ourselves first?[/quote] Can you try once enabling the USB logs and compare the logs for both success and failure case? Please refer USB_LOGs Regards, Tushar
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