status register
| UIF | Update interrupt flag |
| CC1IF | Capture/compare 1 interrupt flag |
| CC2IF | Capture/Compare 2 interrupt flag |
| CC3IF | Capture/Compare 3 interrupt flag |
| CC4IF | Capture/Compare 4 interrupt flag |
| TIF | Trigger interrupt flag |
| CC1OF | Capture/Compare 1 overcapture flag |
| CC2OF | Capture/compare 2 overcapture flag |
| CC3OF | Capture/Compare 3 overcapture flag |
| CC4OF | Capture/Compare 4 overcapture flag |
| IDXF | Index interrupt flag |
| DIRF | Direction change interrupt flag |
| IERRF | Index error interrupt flag |
| TERRF | Transition error interrupt flag |