71.5.3 VBUS Management

Any I/O configured as an input with level detection can be used to monitor the VBUS signal. Software has to generate an interrupt on level detection and write the relevant VBUS bit in SFR_UTMI0R0, SFR_UTMI0R1 or SFR_UTMI0R2, respectively for USB ports A, B or C, in order to indicate to the USB controller the VBUS signal is valid.

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