Espressif ESP32 Technical Reference Manual page 88

4 IO_MUX and GPIO Matrix (GPIO, IO_MUX)
31 30 29 28 27 26 25
2 0 0 0 2
RTCIO_XTAL_X32N_DRV Select the drive strength of the pad. (R/W)
RTCIO_XTAL_X32N_HOLD Set to 1 to hold the output value on the pad; 0 is for normal operation.
(R/W)
RTCIO_XTAL_X32N_RDE 1: Pull-down on pad enabled; 0: Pull-down disabled. (R/W)
RTCIO_XTAL_X32N_RUE 1: Pull-up on pad enabled; 0: Pull-up disabled. (R/W)
RTCIO_XTAL_X32P_DRV Select the drive strength of the pad. (R/W)
RTCIO_XTAL_X32P_HOLD Set to 1 to hold the output value on the pad, 0 is for normal operation.
(R/W)
RTCIO_XTAL_X32P_RDE 1: Pull-down on pad enabled; 0: Pull-down disabled. (R/W)
RTCIO_XTAL_X32P_RUE 1: Pull-up on pad enabled; 0: Pull-up disabled. (R/W)
RTCIO_XTAL_DAC_XTAL_32K 32K XTAL bias current DAC value. (R/W)
RTCIO_XTAL_XPD_XTAL_32K Power up 32 KHz crystal oscillator. (R/W)
RTCIO_XTAL_X32N_MUX_SEL 0: route X32N pad to the digital IO_MUX; 1: route to RTC block.
(R/W)
RTCIO_XTAL_X32P_MUX_SEL 0: route X32P pad to the digital IO_MUX; 1: route to RTC block.
(R/W)
RTCIO_XTAL_X32N_FUN_SEL Select the RTC function. 0: select function 0. (R/W)
RTCIO_XTAL_X32N_SLP_SEL Sleep mode selection. Set this bit to 1 to put the pad to sleep. (R/W)
RTCIO_XTAL_X32N_SLP_IE Input enable of the pad in sleep mode. 1: enabled; 0: disabled. (R/W)
RTCIO_XTAL_X32N_SLP_OE Output enable of the pad. 1: enabled; 0; disabled. (R/W)
RTCIO_XTAL_X32N_FUN_IE Input enable of the pad. 1: enabled; 0: disabled. (R/W)
RTCIO_XTAL_X32P_FUN_SEL Select the RTC function. 0: select function 0; 1: select function 1.
(R/W)
RTCIO_XTAL_X32P_SLP_SEL Sleep mode selection. Set this bit to 1 to put the pad to sleep. (R/W)
RTCIO_XTAL_X32P_SLP_IE Input enable of the pad in sleep mode. 1: enabled; 0: disabled. (R/W)
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Espressif Systems
Register 4.51. RTCIO_XTAL_32K_PAD_REG (0x008C)
24 23 22 21 20 19 18 17
0 0 0 0 1 0 0 0
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16 15 14 13 12 11 10 9
0 0 0 0 0 0
88
8 7 6 5 4 3 2 1
0 0 0 0 1 0 0 0
ESP32 TRM (Version 5.2)
0
0 Reset