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參數(shù)資料
| 型號(hào)： | M308B8FCGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144 |
| 文件頁(yè)數(shù)： | 35/70頁(yè) |
| 文件大小： | 1150K |
| 代理商： | M308B8FCGP |
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40
XMEGA D4 [DATASHEET]
8135P–AVR–01/2014
22.
USART
22.1 Features
Two identical 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
Operation up to 1/2 of the peripheral clock frequency
IRCOM module for IrDA compliant pulse modulation/demodulation
22.2 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 and PORTD each has one USART. Notation of these peripherals are USARTC0 and USARTD0 respectively.
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| M309 | 功能描述:折皺器 CRIMP TOOL HIGH POWER RoHS:否 制造商:Hirose Connector 類型: 描述/功能:Cable and Shield Crimper |
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