OTG device endpoint-1 interrupt register
| XFRC | Transfer completed interrupt |
| EPDISD | Endpoint disabled interrupt |
| TOC | Timeout condition |
| ITTXFE | IN token received when TxFIFO is empty |
| INEPNE | IN endpoint NAK effective |
| TXFE | Transmit FIFO empty |
| TXFIFOUDRN | Transmit Fifo Underrun |
| BNA | Buffer not available interrupt |
| PKTDRPSTS | Packet dropped status |
| BERR | Babble error interrupt |
| NAK | NAK interrupt |