Datasheet

24. USART - Universal Synchronous and Asynchronous serial Receiver

and Transmitter

24.1 Features

• Full Duplex Operation (Independent Serial Receive and Transmit Registers)

• Asynchronous or Synchronous Operation

• Master or Slave Clocked Synchronous Operation

• High Resolution Baud Rate Generator

• Supports Serial Frames with 5, 6, 7, 8, or 9 data bits and 1 or 2 stop bits

• Odd or Even Parity Generation and Parity Check Supported by Hardware

• Data OverRun Detection

• Framing Error Detection

• Noise Filtering Includes False Start Bit Detection and Digital Low Pass Filter

• Three Separate Interrupts on TX Complete, TX Data Register Empty and RX Complete

• Multi-processor Communication Mode

• Double Speed Asynchronous Communication Mode

24.2 Overview

The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a highly-

flexible serial communication device. A simplified block diagram of the USART Transmitter is shown in the

figure below. CPU accessible I/O Registers and I/O pins are shown in bold.

AVR 8-Bit Microcontroller

USART - Universal Synchronous and Asynchrono...

Datasheet Complete

40001974A-page 183