UART例程供初学者学习，以及C语言者参考，在函数中可看到详细信息-UART software for reference

DEscr iptION: An interrupt is generated when the UART has finished transmitting or receiving a byte. The interrupt handling routines use circular buffers for buffering received and transmitted data. The UART_RX_BUFFER_SIZE and UART_TX

verilog 编写的串口发送和接收模块，能够设定停止位和校验位，并且包含了modelsim仿真文件。-verilog prepared by the serial port to send and receive module, capable of setting the stop bit and the parity bit, and includes modelsim simulation files.

atmega的串口发送，发送字符串，指定字符HEX，ASCii(Atmega serial transmission, send string, specifying the characters HEX, ASCii)