ESP8266 datasheet(87/117 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/

Logo

87 / 117 page

11. UART Introduction

UART0 will default output some print while booting ,the baud rate of this period print

contents is relate with external crystal frequency.When using the 40M crystal,this section

print baud rate is 115200.When use the 26M crystal,this section print baud rate is 74880.

If this print affect application function, you can abandon print output indirectly while power-

on period in the fourth quarter method.

11.2. Hardware Resources

Both UART0 and UART1 have a length of 128 Byte hardware, read and write FIFO

operations are at the same address.

The hardware registers of two UART module are the same, and distinguished by macro

deﬁnitions of UART0 / UART1.

11.3. Parameter Conﬁguration

UART attribute parameters are all in UART_CONF0 register, can be found in the

Uart_register.h. You can conﬁgure UART properties through modifying the different bit of

the register.

11.3.1. The Baud Rate

The serial of ESP8266 can support the baud rate range from 300 to 115200 * 40.

Espressif

! /!

79 104

2017.05

ESP8266 Datasheet(PDF) 87 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.