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AT90USB646 Datasheet(PDF) 182 Page - ATMEL Corporation

Part # AT90USB646
Description  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 182 Page - ATMEL Corporation

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182
7593A–AVR–02/06
AT90USB64/128
18. USART
The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a
highly flexible serial communication device. The main features are:
•
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
.
18.1 Overview
A simplified block diagram of the USART Transmitter is shown in Figure 18-1 on page 183. CPU
accessible I/O Registers and I/O pins are shown in bold.



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