ESP8684 datasheet(36/60 Pages) ESPRESSIF

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4 Functional Description

4.2

Peripherals

This section describes the chip’s peripheral capabilities, covering connectivity interfaces and on-chip sensors

that extend its functionality.

4.2.1

Connectivity Interface

This subsection describes the connectivity interfaces on the chip that enable communication and interaction

with external devices and networks.

4.2.1.1 UART Controller

The UART Controller in the ESP8684 chip facilitates the transmission and reception of asynchronous serial

data between the chip and external UART devices. It supports two UART interfaces.

Feature List

• Full-duplex asynchronous communication

• Configurable baud rate, up to 2.5 Mbaud

• Automatic baud rate detection of input signals

• Data frame format:

– a START bit

– data bits, ranging from 5 ~ 8

– a parity bit

– stop bits, whose length can be 1, 1.5, or 2 bits

• Special character AT_CMD detection

• Supported protocols: RS485, IrDA

• UART as wake-up source

• Software and hardware flow control

• Three clock sources that can be divided:

– 40 MHz PLL_F40M_CLK

– internal fast RC oscillator RC_FAST_CLK

– external crystal clock XTAL_CLK

• 512 x 8-bit RAM shared by TX FIFOs and RX FIFOs of the two UART controllers

For details, see ESP8684 Technical Reference Manual > Chapter UART Controller (UART, LP_UART).

Pin Assignment

For UART, the pins used can be chosen from any GPIOs via the GPIO Matrix.

For more information about the pin assignment, see Section 2.3 IO Pins and

ESP8684 Technical Reference Manual > Chapter IO MUX and GPIO Matrix.

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ESP8684 Series Datasheet v2.0

ESP8684 Datasheet(PDF) 36 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.