clear interrupt
| THRES1_LOW_INT_CLR | interrupt of thres1 low |
| THRES0_LOW_INT_CLR | interrupt of thres0 low |
| THRES1_HIGH_INT_CLR | interrupt of thres1 high |
| THRES0_HIGH_INT_CLR | interrupt of thres0 high |
| APB_SARADC2_DONE_INT_CLR | interrupt of sar2 done |
| APB_SARADC1_DONE_INT_CLR | interrupt of sar1 done |