AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

19. EUSART (Extended USART)

The Extended Universal Synchronous and Asynchronous serial Receiver and Transmitter

(EUSART) provides functionnal extensions to the USART.

19.1 Features

• Independant 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 encoder/decoder (for DALI Communications)

• Manchester framing error detection

• Bit ordering (MSB first or LSB first)

19.2 Overview

A simplified block diagram of the EUSART Transmitter is shown in Figure 19-1. CPU accessible

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

Figure 19-1. EUSART Block Diagram

UBRR[H:L]

BAUD RATE GENERATOR

CLKio

SYNC LOGIC

EUDR

(Transmit)

UDR

(Transmit)

TRANSMIT SHIFT REGISTER

PARITY

GENERATOR

RECEIVE SHIFT REGISTER

EUDR

(Receive)

UDR

(Receive)

CLOCK

RECOVERY

DATA

RECOVERY

PARITY

CHECKER

Clock Generator

PIN

CONTROL

XCK

MANCHESTER

ENCODER

Transmitter

TX

CONTROL

PIN

CONTROL

TxD

MANCHESTER

DECODER

Receiver

RX

CONTROL

PIN

CONTROL

RxD

UCSRA

UCSRB

UCSRC

EUCSRA

EUCSRB

EUCSRC

The EUSART is activated with the EUSART bit of EUCSRB register. Until this bit is not set, the

USART will behave as standard USART, all the functionnalities of the EUSART are not

accessible.

4317K–AVR–03/2013

212

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