在一些应用中，经常要用到双串口，但是一般单片机只提供一个串口，其实完全可以用普通I/O口模拟一个串口。这里介绍一个用AVR单片机模拟的串口程序.-in some applications, the regular use of the dual serial port, but most only provide a microcontroller serial, In fact, the general can use I / O simulation of a serial mouth. Here on a simulation using AVR Serial procedures.