BLERXTX_IEVR register
| TX_IEV | TX_IEV: interrupt polarity event on TX_SEQUENCE signal: 0: detection on falling edge / low level (default). 1: detection on rising edge / high level | 
| RX_IEV | RX_IEV: interrupt polarity event on RX_SEQUENCE signal: 0: detection on falling edge / low level (default). 1: detection on rising edge / high level |