Fluke 8051Pod-40pinclip-comp 电路.pdf

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1、Fluke9000A-201 Clip-OnAdapterInstructionSheet Usingthe9000A-201Clip-OnOption The9000A-201C1ip-OnAdapterenablesthe9000A-80S1InterfacePod and a 9000Series Micro-systemTroubleshooterto be used withUUTsthat have a soldered-inmicroprocessor.The 9000A-805lInterfacePod isnormallyused withUUTsthat have sock

2、etedmicroprocessors.The microprocessoris removed andreplaced by the Pods DIPplug.If the microprocessoris solderedinto place,thentheClip-OnAdapteris used to connectthe Pod to ,the UUT. ThisInstructionSheetcontainsthe basicinformationfor usingthe Clip-On Adapter.Formore completeinformation,refertoAppe

3、ndixB inthe9000A- 8051 InterfacePod Instructionmanual. theoryofOperation When SWitch6 on thePodissettotheCLIP-ON position,thePod pullspin9 (RST) highviaa lkohm resistor.When RST isthusheldhigh,allofthe 8051slines,exceptthe two clock linesXTALlandXTAL2, areforcedto high impedancestates.This allowsthe

4、Pod to overdrivethesoldered-in microprocessorwhileconnectedtoitwiththeClip-OnAdapter.The UUTmust nottryto forcethe RSTlinelowCeitherby a gateor by a pull-down resistorsmallerthan4k ohms).IftheResetlinegoestoperipherals,such asPIAsor CRTControllers,theywillbe heldreset. . ConfigurationSwitches SetSWi

5、tch6, the UUTConnection switch,to the CLIP-ONposition. SetSWitches7 and 8,theClock Configurationswitches,as follows: 0. For UUTswithan externalcrystal,setSWitch 7 to the XTAL position,and setSWitch 8 tothe XTALl position. 0For UUTswithexternalTTL clocks,settheswitchesaccordingto. instructionsin Para

6、graph2-3 of the9000A-8051 InterfacePod Instructionmanual. TestingWith theClip-OnAdapter Q1ce the Pod isattachedto the UUTwiththe Clip-OnAdapter,most test proceduresremainthesame. Resetswillnot be receivedfrom theUUTduring RUNUUT. sincethe RST lineisalreadyhigh.Sincesame UUTswillnot operate withoutRe

7、sets,itmay be possibleforRUNUUTto failon those devices. Same8051 microprocessorswith-AH part-numbersuffixeshave a testmode thatisactivatedby holdingRST highanddrivingALE andIiSERlowduringan externalprogrSl!ad.Thistestmodedrivesallportpinslow foronebus , PIN 745240 NJlmmER1984 (c)1984,JohnFlukeMfg.,I

8、nc.,allrightsresetVed.IFLUKEI . :. 收音机爱好者资料库 Ra d i o Fa n s .CN cycleaftera UUTaccess.Although thisdoes not interferewith the Pods opEration,it could causespuriousaccessesor unwantedportaction.This test mooe willalsocauseRUN UUl tofail,sincethePod andthesoldered-in mic.roprocessorwillbothconflicton

9、thebus. Troubleshootinga CliJ;H)11dapter If the Pod passes its Self Test but doesnot work withthe Clip-OnAdapter, checktheadapterwiththefollowingtests: 2. Pluga 40-pinheaderintothe PodsSelf-TestSocket,thenattach thePod plugusingtheClip-OnAdapter.PressBUSTFSltoinitiate a selftest,which willtesttheada

10、pterforcontinuity. ConnectthePod totheUUTusingtheClip-OnAdapter,and use an oscilloscopeto checkthata clocksignalispresentatboththe uur,pins18 and/or19, and atthePcd plug,pins18 and 19. 1. Verifythatthelogiclevelatpin9 of theuurssoldered-in microprocessor(thepod-drivenRSr signal)isatleast4 volts. Iftheseproceduresdo notyielda solution,contactyour nearestFluke TechnicalServiceCenterforadvice. 3. Clip-On Adapter Assembly PIN739490 Pod Plug Clip-On Adapter ClipPIN 740639 Soldered-InMicroprocessor :. 收音机爱好者资料库 Ra d i o Fa n s .CN