USB Status Register
| UI | USB Interrupt (USBINT) - R/WC |
| UEI | USB Error Interrupt (USBERRINT) - R/WC |
| PCI | Port Change Detect - R/WC |
| FRI | Frame List Rollover - R/WC |
| SEI | System Error- R/WC |
| AAI | Interrupt on Async Advance - R/WC |
| URI | USB Reset Received - R/WC |
| SRI | SOF Received - R/WC |
| SLI | DCSuspend - R/WC |
| ULPII | ULPI Interrupt - R/WC |
| HCH | HCHaIted - Read Only |
| RCL | Reclamation - Read Only |
| PS | Periodic Schedule Status - Read Only |
| AS | Asynchronous Schedule Status - Read Only |
| NAKI | NAK Interrupt Bit–RO |
| TI0 | General Purpose Timer Interrupt 0(GPTINT0)–R/WC |
| TI1 | General Purpose Timer Interrupt 1(GPTINT1)–R/WC |