一个关于超声波的C程序，许多人超声波程序在12C5A系列单片机上运行不好，这个程序可以帮助解决有关时序问题，这是个时序为1T的单片机的程序，适合STC时序为1T的单片机芯片-An ultrasonic C program, many people ultrasonic procedures running on a in 12C5A series microcontroller bad, this program can help to solve the timing problem, this is a timing 1T MCU program, suitable for STC timing a 1T of microcontroller chip