Espressif ESP32 Technical Reference Manual page 65

4 IO_MUX and GPIO Matrix (GPIO, IO_MUX)
Name
IO_MUX_GPIO25_REG
IO_MUX_GPIO26_REG
IO_MUX_GPIO27_REG
IO_MUX_MTMS_REG
IO_MUX_MTDI_REG
IO_MUX_MTCK_REG
IO_MUX_MTDO_REG
IO_MUX_GPIO2_REG
IO_MUX_GPIO0_REG
IO_MUX_GPIO4_REG
IO_MUX_GPIO16_REG
IO_MUX_GPIO17_REG
IO_MUX_SD_DATA2_REG
IO_MUX_SD_DATA3_REG
IO_MUX_SD_CMD_REG
IO_MUX_SD_CLK_REG
IO_MUX_SD_DATA0_REG
IO_MUX_SD_DATA1_REG
IO_MUX_GPIO5_REG
IO_MUX_GPIO18_REG
IO_MUX_GPIO19_REG
IO_MUX_GPIO20_REG
IO_MUX_GPIO21_REG
IO_MUX_GPIO22_REG
IO_MUX_U0RXD_REG
IO_MUX_U0TXD_REG
IO_MUX_GPIO23_REG
IO_MUX_GPIO24_REG
1. GPIO20 is only available for ESP32-PICO-V3 and ESP32-PICO-V3-02. Please refer to
for more information.
4.12.3 RTC IO MUX Register Summary
Name
GPIO configuration / data registers
RTCIO_RTC_GPIO_OUT_REG
RTCIO_RTC_GPIO_OUT_W1TS_REG
RTCIO_RTC_GPIO_OUT_W1TC_REG
RTCIO_RTC_GPIO_ENABLE_REG
RTCIO_RTC_GPIO_ENABLE_W1TS_REG
RTCIO_RTC_GPIO_ENABLE_W1TC_REG
RTCIO_RTC_GPIO_STATUS_REG
RTCIO_RTC_GPIO_STATUS_W1TS_REG
Espressif Systems
Description
Configuration register for pad GPIO25
Configuration register for pad GPIO26
Configuration register for pad GPIO27
Configuration register for pad MTMS
Configuration register for pad MTDI
Configuration register for pad MTCK
Configuration register for pad MTDO
Configuration register for pad GPIO2
Configuration register for pad GPIO0
Configuration register for pad GPIO4
Configuration register for pad GPIO16
Configuration register for pad GPIO17
Configuration register for pad SD_DATA2
Configuration register for pad SD_DATA3
Configuration register for pad SD_CMD
Configuration register for pad SD_CLK
Configuration register for pad SD_DATA0
Configuration register for pad SD_DATA1
Configuration register for pad GPIO5
Configuration register for pad GPIO18
Configuration register for pad GPIO19
Configuration register for pad GPIO20
Configuration register for pad GPIO21
Configuration register for pad GPIO22
Configuration register for pad U0RXD
Configuration register for pad U0TXD
Configuration register for pad GPIO23
Configuration register for pad GPIO24
Description
RTC GPIO output register
RTC GPIO output bit set register
RTC GPIO output bit clear register
RTC GPIO output enable register
RTC GPIO output enable bit set register
RTC GPIO output enable bit clear register
RTC GPIO interrupt status register
RTC GPIO interrupt status bit set register
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Address
0x3FF49024
0x3FF49028
0x3FF4902C
0x3FF49030
0x3FF49034
0x3FF49038
0x3FF4903C
0x3FF49040
0x3FF49044
0x3FF49048
0x3FF4904C
0x3FF49050
0x3FF49054
0x3FF49058
0x3FF4905C
0x3FF49060
0x3FF49064
0x3FF49068
0x3FF4906C
0x3FF49070
0x3FF49074
1
0x3FF49078
0x3FF4907C
0x3FF49080
0x3FF49084
0x3FF49088
0x3FF4908C
0x3FF49090
ESP32-PICO Series Datasheet
Address
0x3FF48400 R/W
0x3FF48404 WO
0x3FF48408 WO
0x3FF4840C R/W
0x3FF48410
0x3FF48414
0x3FF48418
0x3FF4841C
ESP32 TRM (Version 5.2)
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Access
WO
WO
WO
WO