IMR1
| RTCSTAMPTAMPLSECSSIM | RTCSTAMPTAMPLSECSSIM |
| RTCSSRUIM | RTCSSRUIM |
| EXTI5IM | Peripheral EXTI5 interrupt mask to CPU1 |
| EXTI6IM | Peripheral EXTI6 interrupt mask to CPU1 |
| EXTI7IM | Peripheral EXTI7 interrupt mask to CPU1 |
| EXTI8IM | Peripheral EXTI8 interrupt mask to CPU1 |
| EXTI9IM | Peripheral EXTI9 interrupt mask to CPU1 |
| EXTI10IM | Peripheral EXTI10 interrupt mask to CPU1 |
| EXTI11IM | Peripheral EXTI11 interrupt mask to CPU1 |
| EXTI12IM | Peripheral EXTI12 interrupt mask to CPU1 |
| EXTI13IM | Peripheral EXTI13 interrupt mask to CPU1 |
| EXTI14IM | Peripheral EXTI14 interrupt mask to CPU1 |
| EXTI15IM | Peripheral EXTI15 interrupt mask to CPU1 |