串口接收1字节数据，然后发送出去1字节 使初学者领略使用中断进行数据通信-Serial port to receive one byte of data, then send out one byte enables beginners to enjoy the use of interruption of data communication

一个能将urat与USB2.0转换的芯片，有四路转换口-Urat can convert a chip with USB2.0, I have four conversion

通用同步异步收发器(USART)提供了一种灵活的方法与使用工业标准NRZ异步串行数据格式的外部设备之间进行全双工数据交换。-The universal synchronous asynchronous receiver transmitter (USART) offers a flexible means of full-duplex data exchange with external equipment requiring an industry standard NRZ asyn

FPGA实现URAT，实现异步串口收发控制(FPGA implements URAT to realize asynchronous serial port and transceiver control)