📈UART Protocol

Notes on USART/UART protocol

Introduction

• Async protocol , uses same baudrate beteween devices to communicate

• Its just converting parallel data into a serial format

• data frame has a start, data, parity , stop bits

• low speed communication usually used for getting debugging info or simple communication

Configuration / Connection

• RX and TX pins are used to connect

• If Hardware flow control is present RTS and CTS pins will be required as well. ( Request to Send and Clear to Send).

UART

Details

• Data frame constitutes a start bit + data(8 or 9 bits) + parity bit and finally stop bit (1 or 2 bits)

• even parity vs odd parity : In even parity the number of 1s is always even including parity bit whereas in odd parity number of 1s is odd including the parity bit.

Usage and limitations

• Used for short distance communication or slower communication

• can be seen used for debugging devices

Reference:

UART: A Hardware Communication Protocol Understanding Universal Asynchronous Receiver/Transmitter | Analog Devices