Espressif ESP01 Quick Start Manual page 14

4 . PERIPHERALS AND SENSORS
Interface
SDIO Slave
EMAC
Note:
• Functions of Motor PWM, LED PWM, UART, I2C, I2S, general purpose SPI and Remote Controller can be configured
to any GPIO except GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11.
• For the items marked with "Any GPIOs*" in the "Pin" column, users should note that GPIO6, GPIO7, GPIO8, GPIO9,
GPIO10 and GPIO11 are connected to the integrated SPI flash of ESP01 and are not recommended for other
uses.
Signal
SD_CLK
SD_CMD
SD_DATA0
SD_DATA1
SD_DATA2
SD_DATA3
EMAC_TX_CLK
EMAC_RX_CLK
EMAC_TX_EN
EMAC_TXD0
EMAC_TXD1
EMAC_TXD2
EMAC_TXD3
EMAC_RX_ER
EMAC_RX_DV
EMAC_RXD0
EMAC_RXD1
EMAC_RXD2
EMAC_RXD3
EMAC_CLK_OUT
EMAC_CLK_OUT_180
EMAC_TX_ER
EMAC_MDC_out
EMAC_MDI_in
EMAC_MDO_out
EMAC_CRS_out
EMAC_COL_out
Pin Function
IO6
IO11
SDIO interface that conforms to the
IO7
industry standard SDIO 2.0 card
IO8
specification.
IO9
IO10
IO0
IO5
IO21
IO19
IO22
IO14
IO12
IO13
IO27
IO25
Ethernet MAC with MII/RMII interface
IO26
TXD0
IO15
IO16
IO17
IO4
Any GPIOs*
Any GPIOs*
Any GPIOs*
Any GPIOs*
Any GPIOs*
13 ESP01 Datasheet V1.0