Atmel AT90PWM2 Manual page 183

18. USART
18.1 Features
18.2 Overview
AT90PWM2/3/2B/3B
184
The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a
highly flexible serial communication device. The main features are:
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Full Duplex Operation (Independent Serial Receive and Transmit Registers)
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Asynchronous or Synchronous Operation
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Master or Slave Clocked Synchronous Operation
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High Resolution Baud Rate Generator
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Supports Serial Frames with 5, 6, 7, 8, or 9 Data Bits and 1 or 2 Stop Bits
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Odd or Even Parity Generation and Parity Check Supported by Hardware
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Data OverRun Detection
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Framing Error Detection
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Noise Filtering Includes False Start Bit Detection and Digital Low Pass Filter
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Three Separate Interrupts on TX Complete, TX Data Register Empty and RX Complete
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Multi-processor Communication Mode
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Double Speed Asynchronous Communication Mode
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USART Extended mode (EUSART) with:
– 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 encode/decoder (for DALI Communications)
– Manchester framing error detection
– Bit ordering configuration (MSB or LSB first)
– Sleep mode exit under reception of EUSART frame
A simplified block diagram of the USART Transmitter is shown in
I/O Registers and I/O pins are shown in bold.
Figure 18-1. CPU accessible
4317I–AVR–01/08