CPU2 interrupt mask register 1
| RTCSTAMP | Peripheral RTCSTAMP interrupt mask to CPU2 |
| RTCWKUP | Peripheral RTCWKUP interrupt mask to CPU2 |
| RTCALARM | Peripheral RTCALARM interrupt mask to CPU2 |
| RCC | Peripheral RCC interrupt mask to CPU2 |
| FLASH | Peripheral FLASH interrupt mask to CPU2 |
| PKA | Peripheral PKA interrupt mask to CPU2 |
| RNG | Peripheral RNG interrupt mask to CPU2 |
| AES1 | Peripheral AES1 interrupt mask to CPU2 |
| COMP | Peripheral COMP interrupt mask to CPU2 |
| ADC | Peripheral ADC interrupt mask to CPU2 |