Espressif ESP32 Technical Reference Manual page 705

31 Low-Power Management (RTC_CNTL)
31 30 29 28
0 0 0 0 0 0 0
RTC_CNTL_SW_SYS_RST SW system reset. (WO)
RTC_CNTL_DG_WRAP_FORCE_NORST The digital core forces no reset in deep sleep. (R/W)
RTC_CNTL_DG_WRAP_FORCE_RST The digital core can force a reset in deep sleep. (R/W)
RTC_CNTL_BIAS_CORE_FORCE_PU BIAS_CORE force power up. (R/W)
RTC_CNTL_BIAS_CORE_FORCE_PD BIAS_CORE force power down. (R/W)
RTC_CNTL_BIAS_CORE_FOLW_8M BIAS_CORE follow CK8M. (R/W)
RTC_CNTL_BIAS_I2C_FORCE_PU BIAS_I2C force power up. (R/W)
RTC_CNTL_BIAS_I2C_FORCE_PD BIAS_I2C force power down. (R/W)
RTC_CNTL_BIAS_I2C_FOLW_8M BIAS_I2C follow CK8M. (R/W)
RTC_CNTL_BIAS_FORCE_NOSLEEP BIAS_SLEEP force no sleep. (R/W)
RTC_CNTL_BIAS_FORCE_SLEEP BIAS_SLEEP force sleep. (R/W)
RTC_CNTL_BIAS_SLEEP_FOLW_8M BIAS_SLEEP follow CK8M. (R/W)
RTC_CNTL_XTL_FORCE_PU Crystal force power up. (R/W)
RTC_CNTL_XTL_FORCE_PD Crystal force power down. (R/W)
RTC_CNTL_BBPLL_FORCE_PU BB_PLL force power up. (R/W)
RTC_CNTL_BBPLL_FORCE_PD BB_PLL force power down. (R/W)
RTC_CNTL_BBPLL_I2C_FORCE_PU BB_PLL_I2C force power up. (R/W)
RTC_CNTL_BBPLL_I2C_FORCE_PD BB_PLL _I2C force power down. (R/W)
RTC_CNTL_BB_I2C_FORCE_PU BB_I2C force power up. (R/W)
RTC_CNTL_BB_I2C_FORCE_PD BB_I2C force power down. (R/W)
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Espressif Systems
Register 31.1. RTC_CNTL_OPTIONS0_REG (0x0000)
23 22 21 20 19 18 17 16
0 0 1 0 0 1 0 0
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15 14 13 12 11 10 9
1 0 0 1 0 0 0 0
705
8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0
ESP32 TRM (Version 5.2)
0
0 Reset