SWPMI Interrupt and Status register
| RXBFF | Receive buffer full flag |
| TXBEF | Transmit buffer empty flag |
| RXBERF | Receive CRC error flag |
| RXOVRF | Receive overrun error flag |
| TXUNRF | Transmit underrun error flag |
| RXNE | Receive data register not empty |
| TXE | Transmit data register empty |
| TCF | Transfer complete flag |
| SRF | Slave resume flag |
| SUSP | SUSPEND flag |
| DEACTF | DEACTIVATED flag |
| RDYF | transceiver ready flag |