TIM1 alternate function option register 1
| BKINE | BRK BKIN input enable  |  
| BKCMP1E | BRK COMP1 enable  |  
| BKCMP2E | BRK COMP2 enable  |  
| BKDF1BK0E | BRK dfsdm1_break[0] enable  |  
| BKINP | BRK BKIN input polarity  |  
| BKCMP1P | BRK COMP1 input polarity  |  
| BKCMP2P | BRK COMP2 input polarity  |  
| ETRSEL | ETR source selection  |