Espressif ESP32 Technical Reference Manual page 93

4 IO_MUX and GPIO Matrix (GPIO, IO_MUX)
31 27 26
0 0 0
RTCIO_XTL_EXT_CTR_SEL Select the external crystal power down enable source to get into
sleep mode.
RTC_CNTL_XTL_EXT_CTR_LV
31 30 29 28 27
0 0 0 0 0
RTCIO_SAR_I2C_SDA_SEL Selects the other pad as the RTC I2C SDA signal.
TOUCH_PAD[1]; 1: pad TOUCH_PAD[3]. Default value is 0. (R/W)
RTCIO_SAR_I2C_SCL_SEL Selects the other pad as the RTC I2C SCL signal.
TOUCH_PAD[0]; 1: pad TOUCH_PAD[2]. Default value is 0. (R/W)
Espressif Systems
Register 4.56. RTCIO_XTL_EXT_CTR_REG (0x00C0)
0 0 0 0 0 0 0 0
0: select GPIO0; 1: select GPIO2, etc.
is the crystal power down enable signal. (R/W)
Register 4.57. RTCIO_SAR_I2C_IO_REG (0x00C4)
0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0
The input value on this pin XOR
0 0 0 0 0 0 0 0
93
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0:
0:
ESP32 TRM (Version 5.2)
0
0
Reset
0
0
Reset
pad
pad