Espressif ESP32 Technical Reference Manual page 716

31 Low-Power Management (RTC_CNTL)
31 28 27 26
0 0 0 0 0 0 0
RTC_CNTL_RTC_RDY_FOR_WAKEUP The value 1 indicates the RTC is ready to be triggered by any
wakeup source. (RO)
RTC_CNTL_MAIN_STATE_IN_IDLE Indicates the RTC state.
• 0: the chip can be either
– in sleep modes.
– entering sleep modes. In this case, wait until
is set, then you can wake up the chip.
– exiting sleep mode. In this case,
come 1.
• 1: the chip is not in sleep modes (i.e. running normally).
(RO)
31 30 29
0 0 0 0 0 0 0
RTC_CNTL_XTL_EXT_CTR_EN Enable control XTAL with external pads. (R/W)
RTC_CNTL_XTL_EXT_CTR_LV 0: power down XTAL at high level, 1: power down XTAL at low level.
(R/W)
Espressif Systems
Register 31.19. RTC_CNTL_LOW_POWER_ST_REG (0x00C0)
20 19 18
0 0 0 0 0 0 0 0
Register 31.20. RTC_CNTL_EXT_XTL_CONF_REG (0x005C)
0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0
RTC_CNTL_RTC_RDY_FOR_WAKEUP
RTC_CNTL_MAIN_STATE_IN_IDLE
0 0 0 0 0 0 0 0
716
0 0 0 0 0 0 0 0
will eventually be-
0 0 0 0 0 0 0 0
ESP32 TRM (Version 5.2)
0
0 Reset
bit
0
0 Reset