Espressif ESP32 Technical Reference Manual page 711

31 Low-Power Management (RTC_CNTL)
31
0 0 0 0 0 0 0
RTC_CNTL_GPIO_WAKEUP_FILTER Enable filter for GPIO wake-up event. (R/W)
RTC_CNTL_WAKEUP_ENA Wake-up enable bitmap. (R/W)
RTC_CNTL_WAKEUP_CAUSE Wake-up cause. (RO)
Espressif Systems
Register 31.13. RTC_CNTL_WAKEUP_STATE_REG (0x0038)
23 22 21
0 0 0 0 0 0 0 0
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11 10
0 0 1 1 0 0
711
0
0x000
Reset
ESP32 TRM (Version 5.2)