Interrupt Mask Register
| SofMsk | Start of Frame Mask |
| RxFLvlMsk | Receive FIFO Non-Empty Mask |
| GINNakEffMsk | Global Non-periodic IN NAK Effective Mask |
| GOUTNakEffMsk | Global OUT NAK Effective Mask |
| ErlySuspMsk | Early Suspend Mask |
| USBSuspMsk | USB Suspend Mask |
| USBRstMsk | USB Reset Mask |
| EnumDoneMsk | Enumeration Done Mask |
| ISOOutDropMsk | Isochronous OUT Packet Dropped Interrupt Mask |
| EOPFMsk | End of Periodic Frame Interrupt Mask |
| IEPIntMsk | IN Endpoints Interrupt Mask |
| OEPIntMsk | OUT Endpoints Interrupt Mask |
| incompISOINMsk | Incomplete Isochronous IN Transfer Mask |
| incomplSOOUTMsk | Incomplete Isochronous OUT Transfer Mask |
| WkUpIntMsk | Resume/Remote Wakeup Detected Interrupt Mask |