基于飞思卡尔MC9S12XS128单片机的超声波控制程序，包含中断，主函数，定义，串口-Microcontroller based on Freescale MC9S12XS128 ultrasonic control program, including interrupts, the main function, definition, serial

用51单片机控制超声波，采用中断方式，用于小车的蔽障，超声波的距离在一米左右,51 single-chip control with ultrasound, using interrupt mode, the cover for the vehicle barrier, ultrasonic distance meters in a