【正文】 is now the technique of manufacture and the product development main trend, is also our country mechanical and electrical industrial development way that must be taken. May believe that it is with the system engineering viewpoint and the method, how studies in the mechanical and electrical system and the product the machinery, the puter, the information processing and the automatic control technology synthesis application, in order to the mechanical and electrical system and the product achieves the best bination. What the integration of machinery product needs is the embedded microputer, but the monolithic integrated circuit has the volume to be small, the integration rate is high, function strong and so on characteristics, is suitable for the embedded application. The smart instrument, the domestic electric appliances, the numericallycontrolled machine tool, the industrial control and so on the electromechanical device and the product uses the monolithic integrated circuit unexpectedly. In the present case, monolithic integrated circuit39。 The profile transformation and the wave shaping electric circuit uses for signal conversion Cheng Ke who and the monolithic integrated circuit connection TTL signal will enlarge。s choice situations. For the convenience putation must demonstrate data value Duan Ma, may transform again it the pression the BCD code, then in the data value which is going to demonstrate through the table lookup each pression BCD code transforms 8 sections of codes to deliver the demonstration buffer, finally passes through the serial port to deliver to the liquid crystal display module demonstrated measured speed or course. When design, should the overall evaluation measure the fast precisi。s establishment to carry on the control to the internal timer T0 work, like this can the precise surveying leave adds to the INT0 pin the pulse width (. to determine signal impulse cycle)。s important symbol. In the world the monolithic integrated circuit chip39。s training, could understand truly the monolithic integrated circuit software and the hardware design and the debugging skill, could the nimble utilization monolithic integrated circuit39。s auxiliary chip, mainly takes on the replacement, the voltage examination, the watchdog and the EEPROM function, this chip39。s installment position will also receive the flexible axle length and bending limit. All these, causes based on the noncontact type tachometer generator39。 second, records the automobile travel with the mechanical counter the accumulation course. The modern automobile is developing to the high speed direction, along with the vehicle speed enhancement, the tradition speedometer which actuates with the flexible axle receives the unprecedented challenge, this is because of the flexible axle when high speed revolving, as a result of steel wire alternate stresses limit limit, but easy to break, simultaneously, the flexible axle will arrange long will have presented the deformation oversized or the movement sluggish and so on phenomena, moreove