USBPCR_TXPREEMPHTUNE
reg = USBPCR_TXPREEMPHTUNE | USBPCR_COMMONONN | USBPCR_POR;
reg = USBPCR_TXPREEMPHTUNE | USBPCR_COMMONONN | USBPCR_POR |
reg = USBPCR_VBUSVLDEXT | USBPCR_TXPREEMPHTUNE | USBPCR_COMMONONN | USBPCR_POR |