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ESP8266 Datasheet(PDF) 11 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

Part # ESP8266
Description  General Purpose Input/Output Interface (GPIO)
PDF  117 Pages
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Manufacturer  ESPRESSIF [ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.]
Direct Link  https://www.espressif.com/
Logo ESPRESSIF - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

ESP8266 Datasheet(HTML) 11 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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1. Overview
Both I2C Master and I2C Slave are supported. I2C interface functionality can be realized via
software programming, the clock frequency reaches 100 kHz at a maximum. It should be
noted that I2C clock frequency should be higher than the slowest clock frequency of the
slave device.
1.5. I2S Interface
ESP8266EX has one I2S data input interface and one I2S data output interface. I2S
interfaces are mainly used in applications such as data collection, processing, and
transmission of audio data, as well as the input and output of serial data. For example, LED
lights (WS2812 series) are supported. The pin definition of I2S is as below. I2S functionality
can be enabled via software programming by using multiplexed GPIOs, and linked list DMA
is supported.
1.6. Universal Asynchronous Receiver Transmitter (UART)
ESP8266EX has two UART interfaces UART0 and UART, the definitions are as below.
Data transfers to/from UART interfaces can be implemented via hardware. The data
transmission speed via UART interfaces reaches 115200 x 40 (4.5 Mbps).
UART0 can be used for communication. It supports fluid control. Since UART1 features
only data transmit signal (Tx), it is usually used for printing log.
Table 1-5. Pin Definitions of I2S
I2S Data Input
Pin Name
Pin Num
IO
Function Name
MTDI
10
IO12
I2SI_DATA
MTCK
12
IO13
I2SI_BCK
MTMS
9
IO14
I2SI_WS
MTDO
13
IO15
I2SO_BCK
U0RXD
25
IO3
I2SO_DATA
GPIO2
14
IO2
I2SO_WS
Table 1-6. Pin Definitions of UART
Pin Type
Pin Name
Pin Num
IO
Function Name
UART0
U0RXD
25
IO3
U0RXD
U0TXD
26
IO1
U0TXD
MTDO
13
IO15
U0RTS
MTCK
12
IO13
U0CTS
UART1
GPIO2
14
IO2
U1TXD
SD_D1
23
IO8
U1RXD
Espressif
! /104
3
2017.05



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