Specifications

4 . PERIP H ERALS AN D SENSO RS
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.
Interface Signal Pin Function
SDIO Slave
SD_CLK
IO6
SDIO interface that conforms to the
industry standard SDIO 2.0 card
specification.
SD_CMD
IO11
SD_DATA0
IO7
SD_DATA1
IO8
SD_DATA2 IO9
SD_DATA3 IO10
EMAC
EMAC_TX_CLK
IO0
Ethernet MAC with MII/RMII interface
EMAC_RX_CLK
IO5
EMAC_TX_EN IO21
EMAC_TXD0 IO19
EMAC_TXD1 IO22
EMAC_TXD2
IO14
EMAC_TXD3
IO12
EMAC_RX_ER
IO13
EMAC_RX_DV IO27
EMAC_RXD0 IO25
EMAC_RXD1 IO26
EMAC_RXD2
TXD0
EMAC_RXD3
IO15
EMAC_CLK_OUT
IO16
EMAC_CLK_OUT_180
IO17
EMAC_TX_ER IO4
EMAC_MDC_out Any GPIOs*
EMAC_MDI_in Any GPIOs*
EMAC_MDO_out
Any GPIOs*
EMAC_CRS_out
Any GPIOs*
EMAC_COL_out
Any GPIOs*
13 ESP01 Datasheet V1.0