Espressif Systems ESP32 Technical Reference Manual page 40

4.11 RTC_MUX Pin List
GPIO Pad Name Function 1
9 SD_DATA_2 SD_DATA2
10 SD_DATA_3 SD_DATA3
11 SD_CMD SD_CMD
12 MTDI MTDI
13 MTCK MTCK
14 MTMS MTMS
15 MTDO MTDO
16 GPIO16 GPIO16
17 GPIO17 GPIO17
18 GPIO18 GPIO18
19 GPIO19 GPIO19
20 GPIO20 GPIO20
21 GPIO21 GPIO21
22 GPIO22 GPIO22
23 GPIO23 GPIO23
25 GPIO25 GPIO25
26 GPIO26 GPIO26
27 GPIO27 GPIO27
32 32K_XP GPIO32
33 32K_XN GPIO33
34 VDET_1 GPIO34
35 VDET_2 GPIO35
36 SENSOR_VP GPIO36
37 SENSOR_CAPP GPIO37
38 SENSOR_CAPN GPIO38
39 SENSOR_VN GPIO39
Reset Configurations
"Reset" column shows each pad's default configurations after reset:
• 0 - IE=0 (input disabled).
• 1 - IE=1 (input enabled).
• 2 - IE=1, WPD=1 (input enabled, pulldown resistor).
• 3 - IE=1, WPU=1 (input enabled, pullup resistor).
Notes
• R - Pad has RTC/analog functions via RTC_MUX.
• I - Pad can only be configured as input GPIO.
Refer to ESP32 Pin List datasheet for more details and a complete table of pin functions.
4.11 RTC_MUX Pin List
Table 18 shows the RTC pins and how they correspond to GPIO pads:
RTC GPIO Num GPIO Num
0 36
1 37
Espressif Systems
Function 2 Function 3 Function 4
SPIHD GPIO9 HS1_DATA2
SPIWP GPIO10 HS1_DATA3
SPICS0 GPIO11 HS1_CMD
HSPIQ GPIO12 HS2_DATA2
HSPID GPIO13 HS2_DATA3
HSPICLK GPIO14 HS2_CLK
HSPICS0 GPIO15 HS2_CMD
- GPIO16 HS1_DATA4
- GPIO17 HS1_DATA5
VSPICLK GPIO18 HS1_DATA7
VSPIQ GPIO19 U0CTS
- GPIO20 -
VSPIHD GPIO21 -
VSPIWP GPIO22 U0RTS
VSPID GPIO23 HS1_STROBE -
- GPIO25 -
- GPIO26 -
- GPIO27 -
- GPIO32 -
- GPIO33 -
- GPIO34 -
- GPIO35 -
- GPIO36 -
- GPIO37 -
- GPIO38 -
- GPIO39 -
Table 18: RTC_MUX Pin Summary
Pad Name
1
SENSOR_VP ADC_H
SENSOR_CAPP ADC_H
39
4 IO_MUX AND GPIO MATRIX
Function 5 Function 6
U1RXD -
U1TXD -
U1RTS -
SD_DATA2 EMAC_TXD3
SD_DATA3 EMAC_RX_ER
SD_CLK EMAC_TXD2
SD_CMD EMAC_RXD3
U2RXD EMAC_CLK_OUT 1
U2TXD EMAC_CLK_180
- -
- EMAC_TXD0
- -
- EMAC_TX_EN
- EMAC_TXD1
-
- EMAC_RXD0
- EMAC_RXD1
- EMAC_RX_DV
- -
- -
- -
- -
- -
- -
- -
- -
Analog Function
2 3
ADC1_CH0 -
ADC1_CH1 -
ESP32 Technical Reference Manual V1.0
Reset Notes
3 -
3 -
3 -
2 R
1 R
1 R
3 R
-
1 -
1 -
1 -
1 -
1 -
1 -
1 -
0 R
0 R
1 R
0 R
0 R
0 R, I
0 R, I
0 R, I
0 R, I
0 R, I
0 R, I