Main status register
| FZC | Freeze mode confirm |
| DZC | Doze mode confirm |
| EOIF | Error occur Interrupt flag |
| QDZIF | Quit doze mode interrupt flag |
| EDZIF | Enter doze mode interrupt flag |
| CUSS | Currently sending status |
| CURS | Currently receiving status |
| LSAMPRX | Last sample level of RX pin |
| REALRX | Real time level of RX pin |