[abstract] in recent years along with the computer in the social domain's seepage and large scale integrated circuit's development, monolithic integrated circuit's application unceasing trend was being thorough. Because it has function, the volume is small, consumes energy lowly, low in price, operation reliable, characteristics and so on easy to operate. Therefore, is suitable specially for with the control related system, more and more widely applies in the automatic control and the intellectualized aspect. this article introduced one kind of new public transportation automatic newspaper station system's principle of design, simultaneously has provided one kind take the 89C51 monolithic integrated circuit as a core, controls the ISD4004 speech chip and the OCM4X8C liquid crystal display module makes screen's new plan. Carries on the overall control using the 89C51 monolithic integrated circuit as CPU, carries on each kind of prompt pronunciation through the voice control electric circuit the broadcast, simultaneously uses the LCD lattice electric circuit to carry on the Chinese character to demonstrate, realized bus's pronunciation automatic newspaper to stand as well as the Chinese character prompt function, has realized the chart article, the pronunciation integration coordinated work, reduced salesman's labor intensity, improved vehicles' grade of service, was one kind of technical and the fashion union new product.
This system is carries on the software design by monolithic integrated circuit's elementary language assembly language, the instruction carries out the speed to be quick, saves the storage space. For ease of the expansion and the change, software's design uses the modular structure, causes the programming the logical relation even more simple and brief, causes the hardware to be coordinated the operation under software's control.
key word: the 89C51 monolithic integrated circuit, the LCD lattice demonstrated that speech chip
