According to the feature of SCM AT89S51 and the characteristics of bus auto-reporter-calling,the article puts the method of using sigle-chip microcomputer to control speech chip auto-reporter-calling.The method of realization of hardware has also been given, the whole process included hardware circuit designing and software program designing ,description the method of using sigle-chip microcomputer and problem that may meet during the application of microcomputer . the article introduces hardware circuit designing mostly. Carries on the overall control by the AT89S51 monolithic integrated circuit as CPU, it can establish the variatevoice information database with the voice chip ISD1730PY, and may carry on the free combination of these sections of voice information, at the same time uses the LED to carry on the stops figure. Therefore when the bus arrives some stands through the keyboard controls this system to carry on the work, giving the voice of stops, at the same time SCM reads the information of stops and sends to the LED .
Keywords: SCM AT89S51, ISD1730speech chip,LED, Bus auto-reporter-calling stop