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1、Ch7???The?Interface?Technology?of?Single?Micro?ComputerlKeywords：接口（Interface）輸入/輸出（I/O，Input/Output）鍵盤（Keyboard）顯示器（Display）發(fā)光二極管（LED，LightEmittingDiode）液晶顯示器（LCD，LiquidCrystalDisplay）打印機(jī)（Printer）模數(shù)轉(zhuǎn)換器（A/DConverter，Analogy/DigitalConverter）數(shù)模轉(zhuǎn)換器（D/AConverter，
2、Digital/AnalogyConverter）lIntroduction：????TheInterfaceof8031composedofkeyboard，display，printer，A/Dconverter，D/Aconverterandsoon.????Theseperatekeyboardandthematrixkeyboardmakeupofthetwoformsofkeyboard.Figure1-TheseperatekeyboardFigure?2-The?4×4keymatrix??????
3、??Akeymatrixofsizem×ncontainsmrowsandncolumns.Thesekeysarelocatedatthem×nintersectingpointsofthematrix.????TheColumnandRowlinesareconnectedwiththeI/Olines.Soweneedm＋nI/Olinestointerfacethiskeymatrix.?????TheLEDhaseightsegmentsfroma，b，c，d，e，f，g，dpandtwodigitpin
4、s---com.Figure?3-LED????Accordingtothemode，LEDdisplaycanbedevidedtostaticdisplayanddynamicdisplay.Figure?4-The?staticLEDdisplay????Figure?5-The?dynamicLEDdisplay????ThetipicalchipofA/DConverterisADC0809，whichisa8-BituPCompatibleA/DConverterswith8-Channel，ADC08
5、09dataacquisitioncomponentisamonolithicCMOSdevicewithan8-bitanalog-to-digitalconverter,8-channelmultiplexerandmicroprocessorcompatiblecontrollogic.The8-bitA/Dconverterusessuccessiveapproximationastheconversiontechnique.Theconverterfeaturesahighimpedancechopper
6、stabilizedcomparator,a256Rvoltagedividerwithanalogswitchtreeandasuccessiveapproximationregister.The8-channelmultiplexercandirectlyaccessanyof8-single-endedanalogsignals.Thedeviceeliminatestheneedforexternalzeroandfull-scaleadjustments.Easyinterfacingtomicropro
7、cessorsisprovidedbythelatchedanddecodedmultiplexeraddressinputsandlatchedTTLTRI-STATE.outputs.ThedesignoftheADC0808,ADC0809hasbeenoptimizedbyincorporatingthemostdesirableaspectsofseveralA/Dconversiontechniques.TheADC0808,ADC0809offershighspeed,highaccuracy,min
8、imaltemperaturedependence,excellentlong-termaccuracyandrepeatability,andconsumesminimalpower.Thesefeaturesmakethisdeviceideallysuitedtoapplicationsfromprocessandmachinecontroltocon
