Espressif ESP32 Technical Reference Manual page 85

4 IO_MUX and GPIO Matrix (GPIO, IO_MUX)
31 30 29 28 27 26 25
0 0 0 0 0 0
RTCIO_ADC_ADCn_HOLD Set to 1 to hold the output value on the pad; 0 is for normal operation.
(R/W)
RTCIO_ADC_ADCn_MUX_SEL 0: route pad to the digital IO_MUX; (R/W)
1: route pad to the RTC block.
RTCIO_ADC_ADCn_FUN_SEL Select the RTC function for this pad. 0: select Function 0; 3: select
Function 1. (R/W)
RTCIO_ADC_ADCn_SLP_SEL Signal selection of pad's sleep mode. Set this bit to 1 to put the pad
to sleep. (R/W)
RTCIO_ADC_ADCn_SLP_IE Input enable of the pad in sleep mode. 1 enabled; 0 disabled. (R/W)
RTCIO_ADC_ADCn_FUN_IE Input enable of the pad. 1 enabled; 0 disabled. (R/W)
Espressif Systems
Register 4.48. RTCIO_ADC_PAD_REG (0x0080)
24 23 22 21 20 19 18 17
0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0
85
0 0 0 0 0 0 0 0
ESP32 TRM (Version 5.2)
0
0 Reset