control register
| FRES | Force USB Reset |
| PDWN | Power down |
| LPMODE | Low-power mode |
| FSUSP | Force suspend |
| RESUME | Resume request |
| ESOFM | Expected start of frame interrupt mask |
| SOFM | Start of frame interrupt mask |
| RESETM | USB reset interrupt mask |
| SUSPM | Suspend mode interrupt mask |
| WKUPM | Wakeup interrupt mask |
| ERRM | Error interrupt mask |
| PMAOVRM | Packet memory area over / underrun interrupt mask |
| CTRM | Correct transfer interrupt mask |