ESP8266 datasheet(14/117 Pages) ESPRESSIF

Part #	ESP8266

Description	General Purpose Input/Output Interface (GPIO)

PDF	117 Pages

Scroll/Zoom	100%

Manufacturer	ESPRESSIF [ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.]

Direct Link	https://www.espressif.com/

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14 / 117 page

2. GPIO

GPIO

2.1. Functional Overview

The ESP8266 has 16 general IOs. Their pin numbers and names are shown in the table

below:

In the QUAD mode ﬂash, 6 IO interfaces are used for ﬂash communication.

In the DUAL mode ﬂash, 4 IO interfaces are used for ﬂash communication.

Table 2-1. GPIO Pin Deﬁnition

GPIO NO.

Pin NO.

Pin name

GPIO0

pin15

GPIO0_U

GPIO1

pin26

U0TXD_U

GPIO2

pin14

GPIO2_U

GPIO3

pin25

U0RXD_U

GPIO4

pin16

GPIO4_U

GPIO5

pin24

GPIO5_U

GPIO6

pin21

SD_CLK_U

GPIO7

pin22

SD_DATA0_U

GPIO8

pin23

SD_DATA1_U

GPIO9

pin18

SD_DATA2_U

GPIO10

pin19

SD_DATA3_U

GPIO11

pin20

SD_CMD_U

GPIO12

pin10

MTDI_U

GPIO13

pin12

MTCK_U

GPIO14

pin9

MTMS_U

GPIO15

pin13

MTDO_U

! Note:

Users may ﬁnd the following documents helpful:

•

Appendix 1 - GPIO Registers

•

List of ESP8266 pin functions:

ESP8266_Pin_List.xlsx: 

http://bbs.espressif.com/viewtopic.php?f=21&t=412&p=1545#p1545

Espressif

! /!

6 104

2017.05

ESP8266 Datasheet(PDF) 14 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

ESP8266 Datasheet(HTML) 14 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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