Espressif Systems ESP32 Technical Reference Manual page 61

4.13 Registers
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 for normal operation.
(R/W)
RTCIO_ADC_ADCn_MUX_SEL 1: route pad to the digital IO_MUX; (R/W)
0: route pad to the RTC block.
RTCIO_ADC_ADCn_FUN_SEL Select the RTC function for this pad. 0: select Function 0; 1: select
Function 1. (R/W)
RTCIO_ADC_ADCn_SLP_SEL Sleep mode selection signal of the pad. 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 (0x0020)
24 23 22 21 20 19 18 35
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
60 ESP32 Technical Reference Manual V1.0
4 IO_MUX AND GPIO MATRIX
0 0 0 0 0 0 0 0
18
0 Reset