基于COPSTM Based Automobile Instrument Cluster.doc

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1、{0>COPSTMBasedAutomobileInstrumentCluster<}0{>基于COPSTM的汽车仪表<0}{0>ABSTRACT<}0{>摘要<0}Dedicatedmicroprocessorsystemsfindincreasingapplicationsinautomobileinstrumentation.人们已经发现专用微处理器系统越来越地应用在汽车仪表上。Fuelinjectionsystems,digitalradiotunersandsimilarapplicationsemployingthemicrocontr

2、ollerhavebecomecommonplace.燃油喷射系统、数字广播调谐器和类似的应用程序已共同采用微控制器。ThispaperdescribesacosteffectivemicrocontrollerimplementationofanautomobileinstrumentclusterbytheCOPSgroupofNationalSemiconductor,SantaClara.本文介绍一种美国国家半导体COPS集团制造的，具有成本效益的汽车仪表微控制器的应用，该微控制器名为圣克拉拉（SantaClara）。Theinstrume

3、ntclusterprovidesavacuumfluorescentdisplayofthevehiclespeed,engineRPM,odometers,batteryvoltage,engineoilpressureandthefuellevel.Amodulardesigninvolvingasinglemicrocontrollerinconjunctionwithperipheralstoaidindataacquisitionfromthetransducersallowsthequantitiestobecomputedwithh

4、ighaccuraciesanddisplayedonarealtimebasis.该仪表对车速、发动机转速、里程计、电池电压、机油压力和燃料水平提供了真空荧光显示。ThesinglemicrocontrollerenvironmentplacessevererestrictionsontheavailabilityofRAMandROM.单片机的环境严重限制了RAM和ROM的可用性。Coupledwiththerequirementofrealtimeoperationtheapplicationposesanontrivialchallenge

5、.再加上实施操作的要求，应用受到了不小的挑战。AnonvolatileRAMaccumulatesthemileagecovered.非易失性的内存计算了所行驶的里程。Hammingcodetechniquesensuretheintegrityofthedatacontainedinthenonvolatilememory.汉明码技术确保了非易失性存储器中数据的完整性。Inclusionofdiagnosticsallowsarapidandthoroughcheckagainstimproperoperationofthemicrocontro

6、ller,peripheralsandthenonvolatilememory.列入诊断可以迅速彻底地检查微控制器、外围设备和非易失性内存的操作不当。ThispaperdescribestheimplementationwithaCOP444Lcontaining128nybblesofRAMand2KbytesofROM.本文介绍了对含128四位元组COP444L和2K字节ROM的实施。Adisplayupdationrateof16Hzcanbecomfortablyrealized.16赫兹的升级显示率可以轻松地得到实现。Overthemic

7、rocomputerusagehasdiversifieddramaticallyinitsscopeandbreadth.微机使用的范围和宽度已经大幅度地多样化了。Dedicatedmicroprocessorsystemsfindincreasingapplicationinautomobileinstrumentationandcontrol.专用微处理器系统已经越来越多地应用在汽车仪表和控制方面。Fromitsinceptiontheautomobilehasacquiredconsiderablesophistication.从一开始，汽

8、车已经得到了相当的成熟。Increasingdemandshavebeenmadeofthecar.越来越多的需求成就了汽