rtc configure register
| SLP_WAKEUP_INT_ENA | enable sleep wakeup interrupt |
| SLP_REJECT_INT_ENA | enable sleep reject interrupt |
| WDT_INT_ENA | enable RTC WDT interrupt |
| BROWN_OUT_INT_ENA | enable brown out interrupt |
| MAIN_TIMER_INT_ENA | enable RTC main timer interrupt |
| SWD_INT_ENA | enable super watch dog interrupt |
| XTAL32K_DEAD_INT_ENA | enable xtal32k_dead interrupt |
| GLITCH_DET_INT_ENA | enbale gitch det interrupt |
| BBPLL_CAL_INT_ENA | enbale bbpll cal end interrupt |