Pending register (EXTI_PR)
| PIF0 | Pending bit 0 |
| PIF1 | Pending bit 1 |
| PIF2 | Pending bit 2 |
| PIF3 | Pending bit 3 |
| PIF4 | Pending bit 4 |
| PIF5 | Pending bit 5 |
| PIF6 | Pending bit 6 |
| PIF7 | Pending bit 7 |
| PIF8 | Pending bit 8 |
| PIF9 | Pending bit 9 |
| PIF10 | Pending bit 10 |
| PIF11 | Pending bit 11 |
| PIF12 | Pending bit 12 |
| PIF13 | Pending bit 13 |
| PIF14 | Pending bit 14 |
| PIF15 | Pending bit 15 |
| PIF16 | Pending bit 16 |
| PIF17 | Pending bit 17 |
| PIF19 | Pending bit 19 |
| PIF20 | Pending bit 20 |
| PIF21 | Pending bit 21 |
| PIF22 | Pending bit 22 |