參數(shù)資料
型號： AV80C52TXXX-20:D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封裝： 1.40 MM HEIGHT, VQFP-44
文件頁數(shù)： 67/134頁
文件大?。?/td> 3805K
38
8068U–AVR–06/2013
XMEGA A3
Not recommended for new designs -
Use XMEGA A3U series
22. USART
22.1
Features
Seven Identical USART peripherals
Full Duplex Operation (Independent Serial Receive and Transmit Registers)
Asynchronous or Synchronous Operation
Master or Slave Clocked Synchronous Operation
High-resolution Arithmetic 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
Master SPI mode for SPI communication
IrDA support through the IRCOM module
22.2
Overview
The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a
highly flexible serial communication module. The USART supports full duplex communication,
and both asynchronous and clocked synchronous operation. The USART can also be set in
Master SPI mode to be used for SPI communication.
Communication is frame based, and the frame format can be customized to support a wide
range of standards. The USART is buffered in both direction, enabling continued data transmis-
sion without any delay between frames. There are separate interrupt vectors for receive and
transmit complete, enabling fully interrupt driven communication. Frame error and buffer over-
flow are detected in hardware and indicated with separate status flags. Even or odd parity
generation and parity check can also be enabled.
One USART can use the IRCOM module to support IrDA 1.4 physical compliant pulse modula-
tion and demodulation for baud rates up to 115.2 kbps.
PORTC, PORTD, and PORTE each has two USARTs, while PORTF has one USART only.
Notation of these peripherals are USARTC0, USARTC1, USARTD0, USARTD1, USARTE0,
USARTE1 and USARTF0, respectively.
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