AT90PWM2 datasheet(185/365 Pages) ATMEL

185 / 365 page

185

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

18. USART

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

highly flexible serial communication device. The main features are:

18.1

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

• USART Extended mode (EUSART) with:

– Independent bit number configuration for transmit and receive

– Supports Serial Frames with 5, 6, 7, 8, 9 or 13, 14, 15, 16, 17 Data Bits and 1 or 2 Stop Bits

– Biphase Manchester encode/decoder (for DALI Communications)

– Manchester framing error detection

– Bit ordering configuration (MSB or LSB first)

– Sleep mode exit under reception of EUSART frame

18.2

Overview

A simplified block diagram of the USART Transmitter is shown in Figure 18-1. CPU accessible

I/O Registers and I/O pins are shown in bold.

AT90PWM2 Datasheet(PDF) 185 Page - ATMEL Corporation