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參數(shù)資料
| 型號： | MR83C154XXX-16P883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁數(shù)： | 82/142頁 |
| 文件大小： | 61013K |
| 代理商： | MR83C154XXX-16P883 |
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44
XMEGA B3 [DATASHEET]
8074D–AVR–08/2013
24.
USART
24.1
Features
One USART peripherals
Full-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 and 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 a specific devices on a multidevice bus
Enable unaddressed devices to automatically ignore all frames
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
24.2
Overview
The universal synchronous and asynchronous serial receiver and transmitter (USART) is a fast and flexible serial
communication module. The USART supports full-duplex communication and asynchronous and synchronous operation.
The USART can be configured to operate in SPI master mode and 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 directions, enabling continued data transmission without any delay between frames. Separate
interrupts for receive and transmit complete enable fully interrupt driven communication. Frame error and buffer overflow
are detected in hardware and indicated with separate status flags. Even or odd parity generation and parity check can
also be enabled.
The clock generator includes a fractional baud rate generator that is able to generate a wide range of USART baud rates
from any system clock frequencies. This removes the need to use an external crystal oscillator with a specific frequency
to achieve a required baud rate. It also supports external clock input in synchronous slave operation.
When the USART is set in master SPI mode, all USART-specific logic is disabled, leaving the transmit and receive
buffers, shift registers, and baud rate generator enabled. Pin control and interrupt generation are identical in both modes.
The registers are used in both modes, but their functionality differs for some control settings.
An IRCOM module can be enabled for one USART to support IrDA 1.4 physical compliant pulse modulation and
demodulation for baud rates up to 115.2kbps.
PORTC has one USART. Notation of this peripheral is USARTC0.
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