control register
| EN | Enable |
| ABORT | Abort request |
| DMAEN | DMA enable |
| TCEN | Timeout counter enable |
| SSHIFT | Sample shift |
| DFM | DFM |
| FSEL | FSEL |
| FTHRES | IFO threshold level |
| TEIE | Transfer error interrupt enable |
| TCIE | Transfer complete interrupt enable |
| FTIE | FIFO threshold interrupt enable |
| SMIE | Status match interrupt enable |
| TOIE | TimeOut interrupt enable |
| APMS | Automatic poll mode stop |
| PMM | Polling match mode |
| PRESCALER | Clock prescaler |