avr单片机串口先进先出实例程序，这是个人在实际项目中应用的一个例子，还有是定时器的使用方法-Examples of single-chip FIFO serial avr procedures, which are individual projects in the actual application of an example are also the use of timer

Also the USART automatically senses the start of transmission of RX line and then inputs the whole byte and when it has the byte it informs you(CPU) to read that data from one of its registers. The USART of AVR is very versatile and can be setup