EXTI event mask register
| MR64 | CPU Event mask on Event input x+64 |
| MR65 | CPU Event mask on Event input x+64 |
| MR66 | CPU Event mask on Event input x+64 |
| MR67 | CPU Event mask on Event input x+64 |
| MR68 | CPU Event mask on Event input x+64 |
| MR69 | CPU Event mask on Event input x+64 |
| MR70 | CPU Event mask on Event input x+64 |
| MR71 | CPU Event mask on Event input x+64 |
| MR72 | CPU Event mask on Event input x+64 |
| MR73 | CPU Event mask on Event input x+64 |
| MR74 | CPU Event mask on Event input x+64 |
| MR75 | CPU Event mask on Event input x+64 |
| MR76 | CPU Event mask on Event input x+64 |
| MR77 | CPU Event mask on Event input x+64 |
| MR78 | CPU Event mask on Event input x+64 |
| MR79 | CPU Event mask on Event input x+64 |
| MR80 | CPU Event mask on Event input x+64 |
| MR82 | CPU Event mask on Event input x+64 |
| MR84 | CPU Event mask on Event input x+64 |
| MR85 | CPU Event mask on Event input x+64 |
| MR86 | CPU Event mask on Event input x+64 |
| MR87 | CPU Event mask on Event input x+64 |
| MR88 | CPU Event mask on Event input x+64 |