R01UH0823EJ0100 Rev.1.00
Page 913 of 1823
Jul 31, 2019
RX23W Group
32. USB 2.0 Host/Function Module (USBc)
32.3.1.4
Example of USB External Connection Circuit
shows an example of OTG connection of the USB connector in the self-powered state.
The USB controls the signals for enabling a pull-up resistor for the D+ signal and pull-down resistors for the D+ and D–
signals. These signals can be pulled up or down using the SYSCFG.DPRPU and SYSCFG.DRPD bits.
When the function controller is selected and the DPRPU bit is set to 0 during communication with the host controller, the
pull-up resistor of the USB data line is disabled, making it possible to notify the USB host of the device disconnection.