Техническая Спецификация для Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105

Модели

ATEVK1105

299

AT32UC3A

26. Universal Synchronous/Asynchronous Receiver/Transmitter (USART)

Rev. 4.0.0.2

26.1

Features

•

Programmable Baud Rate Generator

•

5- to 9-bit Full-duplex Synchronous or Asynchronous Serial Communications

– 1, 1.5 or 2 Stop Bits in Asynchronous Mode or 1 or 2 Stop Bits in Synchronous Mode

– Parity Generation and Error Detection

– Framing Error Detection, Overrun Error Detection

– MSB- or LSB-first

– Optional Break Generation and Detection

– By 8 or by 16 Over-sampling Receiver Frequency

– Optional Hardware Handshaking RTS-CTS

– Receiver Time-out and Transmitter Timeguard

– Optional Multidrop Mode with Address Generation and Detection

•

RS485 with Driver Control Signal

•

ISO7816, T = 0 or T = 1 Protocols for Interfacing with Smart Cards

– NACK Handling, Error Counter with Repetition and Iteration Limit

•

IrDA Modulation and Demodulation

– Communication at up to 115.2 Kbps

•

SPI Mode

– Master or Slave

– Serial Clock Programmable Phase and Polarity

– SPI Serial Clock (CLK) Frequency up to Internal Clock Frequency CLK_USART/4

•

Test Modes

– Remote Loopback, Local Loopback, Automatic Echo

•

Supports Connection of Two Peripheral DMA Controller Channels (PDC)

– Offers Buffer Transfer without Processor Intervention

26.2

Overview

The Universal Synchronous Asynchronous Receiver Transceiver (USART) provides one full

duplex universal synchronous asynchronous serial link. Data frame format is widely programma-

ble (data length, parity, number of stop bits) to support a maximum of standards. The receiver

implements parity error, framing error and overrun error detection. The receiver time-out enables

handling variable-length frames and the transmitter timeguard facilitates communications with

slow remote devices. Multidrop communications are also supported through address bit han-

dling in reception and transmission.
The USART features three test modes: remote loopback, local loopback and automatic echo.
The USART supports specific operating modes providing interfaces on RS485 and SPI buses,

with ISO7816 T = 0 or T = 1 smart card slots and infrared transceivers. The hardware handshak-

ing feature enables an out-of-band flow control by automatic management of the pins RTS and

CTS.
The USART supports the connection to the Peripheral DMA Controller, which enables data

transfers to the transmitter and from the receiver. The PDC provides chained buffer manage-

ment without any intervention of the processor.

32058K AVR32-01/12