这是一个只要带定时器的单片机都能用普通的I/O口模拟出一个串口的程序，当你的串口不够用时，他可是非常好的东西哟！-This is a band as long as the timer can use an ordinary single-chip I/O port simulation of a serial process, when you use the serial port not enough, he is very good but yo!