USB_U2P3_CTRL
ocp_word_set_bits(tp, MCU_TYPE_USB, USB_U2P3_CTRL, U2P3_ENABLE);
ocp_word_clr_bits(tp, MCU_TYPE_USB, USB_U2P3_CTRL, U2P3_ENABLE);
ocp_word_set_bits(tp, MCU_TYPE_USB, USB_U2P3_CTRL, RX_DETECT8);