Universal Synchronous And Asynchronous Receiver And Transmitter (Usart); Features; Overview - Microchip Technology megaAVR 0 Series Manual

22. Universal Synchronous and Asynchronous Receiver and Transmitter
(USART)
22.1

Features

• Full-Duplex or One-Wire Half-Duplex Operation
• Asynchronous or Synchronous Operation:
– Synchronous clock rates up to 1/2 of the device clock frequency
– Asynchronous clock rates up to 1/8 of the device clock frequency
• Supports Serial Frames with:
– 5, 6, 7, 8, or 9 data bits
– Optionally even and odd parity bits
– 1 or 2 Stop bits
• Fractional Baud Rate Generator:
– Can generate desired baud rate from any system clock frequency
– No need for external oscillator with certain frequencies
• Built-In Error Detection and Correction Schemes:
– Odd or even parity generation and parity check
– Data overrun and framing error detection
– Noise filtering includes false Start bit detection and digital low-pass filter
• Separate Interrupts for:
– Transmit complete
– Transmit Data register empty
– Receive complete
• Multiprocessor Communication mode:
– Addressing scheme to address specific devices on a multi-device bus
– Enable unaddressed devices to automatically ignore all frames
• Start Frame Detection in UART mode
• Master SPI mode:
– Double buffered operation
– Configurable data order
– Operation up to 1/2 of the peripheral clock frequency
• IRCOM Module for IrDA Compliant Pulse Modulation/Demodulation
• LIN Slave Support:
– Auto-baud and Break character detection
• RS-485 Support
22.2

Overview

The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) peripheral is a
fast and flexible serial communication module. The USART supports full-duplex communication,
asynchronous and synchronous operation and one-wire configurations. The USART can be set in SPI
master mode and used for SPI communication.
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2018 Microchip Technology Inc.
Universal Synchronous and Asynchronous Recei...
Datasheet Preliminary
®
megaAVR 0-Series
DS40002015A-page 280