Espressif ESP32 Technical Reference Manual page 83

4 IO_MUX and GPIO Matrix (GPIO, IO_MUX)
31
RTCIO_DIG_PAD_HOLD_REG Selects the digital pads which should be put on hold. While 0 allows
normal operation, 1 puts the pad on hold. (R/W)
Name
Bit[0]
Bit[1]
Bit[2]
Bit[3]
Bit[4]
Bit[5]
Bit[6]
Bit[7]
Bit[8]
Bit[9]
Bit[10]
Bit[11]
Bit[12]
Bit[13]
Bit[14]
Bit[15]
Bit[16]
1. GPIO20 is only available for ESP32-PICO-V3 and ESP32-PICO-V3-02. Please refer to
for more information.
Espressif Systems
Register 4.46. RTCIO_DIG_PAD_HOLD_REG (0x0074)
0
Table 4-8. Mapping of Bits to Pins
Description
Set to 1 to enable the Hold function of pad U0RXD
Set to 1 to enable the Hold function of pad U0TXD
Set to 1 to enable the Hold function of pad
SD_CLK
Set to 1 to enable the Hold function of pad
SD_DATA0
Set to 1 to enable the Hold function of pad
SD_DATA1
Set to 1 to enable the Hold function of pad
SD_DATA2
Set to 1 to enable the Hold function of pad
SD_DATA3
Set to 1 to enable the Hold function of pad
SD_CMD
Set to 1 to enable the Hold function of pad GPIO5
Set to 1 to enable the Hold function of pad GPIO16
Set to 1 to enable the Hold function of pad GPIO17
Set to 1 to enable the Hold function of pad GPIO18
Set to 1 to enable the Hold function of pad GPIO19
Set to 1 to enable the Hold function of pad
GPIO20
Set to 1 to enable the Hold function of pad GPIO21
Set to 1 to enable the Hold function of pad
GPIO22
Set to 1 to enable the Hold function of pad
GPIO23
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ESP32-PICO Series Datasheet
ESP32 TRM (Version 5.2)