control register
| CSRST | Core soft reset |
| DISUSB | Disable usb phy |
| LPM | Low power mode |
| SSP | Soft suspend config |
| GRESUME | Generate resume request |
| LSOFIEN | Lost start of frame interrupt enable |
| SOFIEN | Start of frame interrupt enable |
| RSTIEN | Bus reset interrupt enable |
| SPIEN | Bus suspend mode interrupt enable |
| WKIEN | Wakeup/Remote wakeup interrupt enable |
| BEIEN | Bus error interrupt enable |
| UCFORIEN | USB Core fifo overrun interrupt enable |
| TCIEN | transmission completed interrupt enable |