BabuMadhavInstituteofInformationTechnology,UTU
5YearsIntegratedM.Sc.(IT)–Semester4
060010309:DSE3–MicroprocessorProgrammingandInterfacing
QuestionBank
Unit1:Introduction
1. Writethedecimalequivalentforeachintegralpowerof2from2! to2!" .
2. Convertthefollowingdecimalnumberstobinary:
22
76
500
3. Convertthefollowingbinarynumbertodecimal:
1011
11010001
11101110010110
4. Converttohexadecimal:
53decimal
756decimal
01101100010binary
11000010111binary
5. Converttodecimal:
D3H
3FEH
44H
6. ConvertthefollowingdecimalnumberstoBCD:
86
62
33
7. Defineparityanddescribehowitisusedtodetectanerrorintransmitteddata.
8. Showadditionof:
10011! and1011! inbinary
37!" and25!" inBCD
4AHand77H
9. Expressthefollowingdecimalnumbersin8-bitsignandmagnitudeform:
+26
-7
-26
-125
10. Showthesubtraction,inbinary,ofthefollowingdecimalnumbers.
7-4
37-26
125–93
11. Showthemultiplicationof1001and011.
12. Showthedivisionof1100100by1010.
13. Dotheindicatedoperationsonthefollowingnumbers:
3AH+94H
17AH–4CH
01011001BCD
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BabuMadhavInstituteofInformationTechnology,UTU
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+01000010BCD
01111001BCD
+01001001BCD
01011001BCD
+00100110BCD
-011000111BCD
-00111001BCD
ShowtheoutputproducedwhenthefollowingbinarywordsareANDedwitheachotherand
whentheyareORedwitheachother:
1010and0111
1011and1100
11010111and111000
ANDingan8-bitbinarynumberwith11110000issometimesreferredtoas“masking”
thelower4bitwhy?
Describethemainadvantageofdistributedprocessingcomputersystemoverasimple
timesharingsystem.
Describethesequenceofsignalsthatoccursontheaddressbus,thecontrolbus,andthe
databuswhenasimplemicrocomputerfetchesaninstruction.
Whatdetermineswhetheramicroprocessorisconsideredan8-bit,a16-bit,ora32-bit
device?
Howmanyaddresslinesdoesan8086have?
Howmanymemoryaddressdoesthisnumberofaddresslinesallowthe8086toaccess
directly?
Atanygiventime,the8086workswithfoursegmentsinthisaddressspace.Howmany
bytesarecontainedineachsegment?
Whatisthemaindifferencebetweenthe8086andthe8088?
Describethefunctionofthe8086queueandHowdoesthequeuespeedupprocessing?
Ifthecodesegmentforan8086programstartsataddress70400H,whatnumberwillbein
theCSregister?Andassumingthissamecodesegmentbase,whatphysicaladdresswilla
codebytebefetchedfromiftheinstructionpointercontain539CH?
Whatphysicaladdressisrepresentedby:4370:561EH,7A32:0028H
WhatistheadvantageofusingaCPUregisterfortemporarydatastorageoverusinga
memorylocation?
Ifthestacksegmentregistercontain3000Handthestackpointerregistercontains8434H,
Whatisthephysicaladdressofthetopofthestack?
Whatistheadvantageofusingassemblylanguageinsteadofwritingaprogramdirectlyin
machinelanguage?
Describetheoperationan8086willperformwhenitexecutesADDAX,BX.
Whattypesofprogramareusuallywritteninassemblylanguage?
Describetheoperationthatan8086willperformwhenitexecuteseachofthefollowing
instructions:
MOVBX,03FFH
MOVAL,0DBH
MOVDH,CL
MOVBX,AX
Writethe8086assemblylanguagestatementwhichwillperformthefollowingoperations:
Loadthenumber7986HintotheBPregister.
CopytheBPregistercontainstotheSPregister.
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CopythecontentsoftheAXregistertotheDSregister.
LoadthenumberF3HintotheALregister.
Ifthe8086executionunitcalculatesaneffectiveaddressof14A34andDScontains7000H
whatphysicaladdresswilltheBUIproduce?
Ifthedatasegmentregister(DS)contains4000H,whatphysicaladdresswilltheinstruction
MOVAL,[234Bh]read?
Ifthe8086datasegmentregistercontains7000H,writetheinstructionthatwillcopythe
contentsofDLtoaddress74B2CH.
DescribethedifferencebetweentheinstructionsMOVAX,2437HandMOVAX,[2437H].
Unit2:8086assemblylanguageprogrammingtechniques
1. Listthemajorstepsindevelopinganassemblylanguageprogram.
2. Whatisthemainadvantageofatop-downdesignapproachtosolvingaprogramproblem?
3. Whyshouldyoudevelopadetailedalgorithmforaprogrambeforewritingdownany
assemblyforaprogrambeforewritingdownanyassemblylanguageinstructions?
4. Whatarethethreebasicstructuretypesusedtowritethealgorithmforaprogram?
5. Whatistheadvantageofusingonlythesestructureswhenwritingthealgorithmfora
program?
6. Useaflowchartorpseudocodetoshowthealgorithmforaprogram,whichgetsanumber
fromamemorylocation,subtracts20Hfromit,andoutputs01Htoport3AHiftheresultof
thesubtractionisgreaterthan25H.
7. Giventheregistercontentsinfigure1answerthefollowingquestions:
a. Whatphysicaladdresswillthenextinstructionbefetchedfrom?
b. Whatisthephysicaladdressforthetopofthestack?
ES=1234h
AX=4321h
SP=1111h
CS=2345h
BX=5432h
BP=2222h
SS=3456h
DS=4567h
CX=6543h
DX=7654h
IP=5678h
SI=3333h
DI=4444h
Figure1.Registercontent
8. Describetheoperationandresultsofeachofthefollowinginstruction,Giventheregister
contentsshowinfigure1includeinyouranswerthephysicaladdressorregisterthateach
instructionwillgetitsoperandsfromandthephysicaladdressorregister.Assumethatthe
followinginstructionsareindependent,notsequential,unlesslistedtogetherunderaletter.
a. MOVAX,BX b. MOVCL,37H
c. INCBX
d. MOVCX.[246BH]
e. MOVCX,246BH
f. ADDAL,DH
g. MULBX
h. DECBP
i. DIVBL
j. SUBAX,DX
k. ORCL,BL
l. NOTAH
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BabuMadhavInstituteofInformationTechnology,UTU
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m. ROLBX,CH
n. ANDAL,CH
o. AOVDS,AX
p. PORBX,CL
q. ANDAL,OFH
r. MOV,AX,[BX]
s. MOV[BX][SI],CL
Seeifyoucanspotthegrammatical(syntax)errorsinthefollowinginstruction.
a. MOVBH,AX
b. MOVDX,CL
c. ADDAL,2073H
d. MOV7632H,CX
e. INBL,04H
Showtheresultsthatwillbeintheaffectedregistersormemorylocationsaftereachofthe
followinggroupsofthefollowinggroupsofinstructionsexecutes.Assumethateachgroup
ofinstructionsstartswiththeregisterandmemorycontentsshowninFigure1.
-ADDBL,AL
MOV[00041,BL
RORDI,04
-MOVCL,04
-ADDAl,BH
DAA
-MOVBX,000AH
MOVAL,[BX]
SUBAL,CL
INCBX
MOV[BX),AL
Writethe8086instructions,whichwillperformtheindicatedoperation.
CopyALtoBL.
Load43HintoCL
IncrementthecontentsofCXby1.
CopySPtoBP.
Add07HtoDL.
MultiplyALtimesBL.
CopyAXtoamemorylocationatoffset245AHindatasegment.
DecrementSPby1.
RotatethemostsignificantbitofALintotheleastsignificantbitposition.
CopyDLtoamemorylocationwhoseoffsetisinBX.
Maskthelower4bitsofBL.
SetthemostsignificantbitofAXtoa1,butdonotaffecttheotherbits.
Inventthelower4bitsofBL,butdonotaffecttheotherbits.
Constructthebinarycodeforeachofthefollowing8086instructions.
MOVBL,AL
RORAX,I
MOV[BX],CX OUTDX,AL
ADDBX,59H[DI]
ANDAL,OFH
SUB[2048],DH NOP
XCHGCH,ES:[BX]
INAL,DX
Describehowanassemblylanguageprogramisadevelopedanddebuggedusingsystem
toolsuchaseditors,assembler,linker,locator,emulatorsanddebuggers.
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Unit3:Procedures,MacrosandAssemblerDirectives
1. DescribestackoperationsduringnearprocedureCALLandRET.
2. Whatisreentrantprocedure?Differentiatereentrantandrecursiveprocedure.
3. Differentiateproceduresandmacros.
4. WriteinstructionformatofCALLinstructionforinter-segment,indirectcall.
5. ExplainSTD,DAS,ROL,JGandCALLinstructionswithexample.
6. Define:Indirectinter-segmentcall.
7. Listoutanytwocontrolflagsof8086.
8. ExplainLEA,ADC,AAA,JLandCMPinstructionswithexample.
9. Define:Directinter-segmentjump.
10. DescribeXCGH,DAA,SBB,RORandPUSHinstructionswithexample.
11. DescribestackoperationsduringnearprocedureCALLandRET.
12. ListoutdifferenttypesofUnconditionalJumpinstructions.Describe8086binarycoding
templateofthesame.
13. Whatisreentrantprocedure?Howtomakeanyprocedureasreentrant?
14. Define:Indirectintra-segmentjump.
15. Describetheoperationandresultofeachofthefollowinginstructionsgiventheregister
containsshowingfigureincludingyouransweredregisterthateachinstructionwillgetits
operandfromenterphysicaladdressofregisterthateachinstructioncangetresultinit.
userinstructiondescriptioninchapter6tohelpyouassumethattheinstructionbeloware
independent,notsequential,unlesslistedtogetherunderaletter
a)ROLLAX,CX
b)INAL,DXP
c)MOVCX,IBX]
d)ADDAX,[BX][SI]
e)JMP023AH
f)JMPBX
16. Constructthebinarycodesforinstructionforquestion15athrough15f.
17. Predictthestateofthe6of8086conditionalflagsaftereachofthefollowinginstructionor
groupofinstructionsexecutes.usetheregisterscontentsshowninfigureassumethatall
flagsareresetbeforetheinstructionexecuteusethedetailinstructiondescriptioninthe
chapter6tohelpyou.
a)MOVAL,AH
b)ADDBL,CL
c)ADDCL,DH
d)ORCX,BX
18. Seeifyoucanfindanyerrorsinthefollowinginstructionofgroupofinstructions.
a)CNTDOWN:MOVBL,72H
DECBL
JNZCNTDOWN
b)ADDCX,AL
c)JMPBL
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BabuMadhavInstituteofInformationTechnology,UTU
d)JNZ[BX]
19. a)writeanalgorithmforprogrammerwhichaddsabytenumberfromonememory
locationtoabytefromnextmemorylocation,putthesuminthirdmemorylocationand
savethestateofflagintheleastsignificantbitofafourthmemorylocation.
b)writean8086assemblylanguageprogramforthisalgorithm.hints:setupdata
declarationssimilartothoseinfigureuseofrotateinstructiontogetthecarryflagstatethe
instructionLSDofregisterormemorylocation
c)whatadditionalinstructionwouldyouhavetoaddtothisprogramsothatitcorrectlyadd
2BCDbytes?
20. AcommonproblemwhenreadingaseriesofASCIIcharactersfromakeyboardistheneed
tofilteroutthosecodeswhichrepresentthehexdigits0to9andatofandconvertthese
ASCIICodestothehexdigitstheyrepresents.example,ifweread34htheASCIIcodefor4.
wewanttomaskupper4bitstoleave04,the8Bithexcodefor4ifwereadin42htheASCII
forB,wewanttoadd09andmasktheupper4bitstoleave0B,the8bitcodeforhexB.if
wereadinanASCIIcodethatisnotintherange30hto39hor31hto36hthenwewantto
loadanderrorcodeofFFHinsteadofthehexvalueoftheenteredcharacter.Figure2shows
describetheactionnexttoeachrangeofASCIIvalueswriteanalgorithmandassembly
languageprogramwhichimplementstheactions.hints:anestedIF-THEN-ELSEstructure
mightbeuseful.
21. Computetheaverageof4bytesstoredinanarrayinmemory
22. Computetheaverageofanynumberofbytesinanarrayinmemory.numberofbytestobe
addedisinthefirstbyteofthearray.
23. Addafive-bytenumberinonearraytoafivebytenumberinanotherarray.putthesamein
anotherarray.putthestateofthecarryflaginbyte6ofthearraythatcontainsthesumthe
firstvalueineacharrayistheleastsignificantbyteofthatnumber.
24. 8086BasedprocesscontrolsystemoutputsaMeasuredFahrenheitTemperaturetoa
displayonitsfrontpanel.youneedwriteashortprogramwhichconvertsFahrenheit
temperaturetoCelsiussothatSystemcanbesoldinEuropetheRelationshipbetween
FahrenheitandCelsiusisC=(F-32)5/9.theFahrenheitTemperaturewillalwaysbeinthe
range50to250.RoundtheCelsiusValuetothenearestdegree.
25. Writeadelayloopwhichproducesadelayof500usonan8086witha5-MHzdelay
26. Writeashortprogramwhichoutputsa1KHzsquarewaveonD0ofportFFFAHthebasic
principleistooutputofhigh,wait500us(0.5ms.outputalowwait500usoutputahigh
etc.)
Unit4:Interfacing
1. Writepinnumberof8086fora)toenablelatch,b)INTA.
2. Drawthecircuitconnectionsforthe3625decoderPROMandfortwoofthe4Kx8RAMs.
3. Showthetruthtableyouwouldusefora3625PROMdecodertoproduceCSIsignalsfor
4Kx8RAMsinan8086system.AssumethefirstRAMstartsataddress00000H.Donot
forgetA0andBHE.
4. Tracebelowprogramandwriteregisterscontentaftereachinstruction.
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5. 6. datasegment
a. ansdb?
b. numdb0f1h
7. ends
8. 9. codesegment
10. start:
a. movax,@data
b. movds,ax
c. moval,num
d. rolal,02
e. roral,03
f. rolal,04
g. roral,05
h. xchgah,al
i. movans,ah
j. movax,4c00h
k. int21h
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11. ends
12. endstart
Explain8086memorybanksanddescribeRAMaddressdecodingontheSDK-86.
DifferentiatememorymappedI/OanddirectI/O.
Showthetruthtableyouwouldusefora3625PROMdecodertoproduceCSIsignalsfor
eight8Kx8ROMsinan8086system.AssumethefirstRAMstartsataddress00000H.Donot
forgetA0andBHE.
Drawtheblockdiagramof8086memorybanks.Explainsignalsforbyteandword
operationsforthesame.
Explain8086memorybanksanddescribeRAMaddressdecodingontheSDK-86.
ListoutwaysofaccessingI/O.Whichwayisbetterinwhichsituation?
ShowthetruthtableyouwoulduseforadecodertoproduceCSIsignalsforfour8Kx8ROMs
inan8086system.
UserdoesnotwanttowastememoryforaccessingI/O.Inthissituationwhichmethodof
accessingI/Oispreferableandwhy?
Drawthecircuitconnectionsforthe3625decoderPROMandfortwoofthe16Kx8RAMS.
Showthetruthtableofaddressalso.
Unit5:8086InterruptsandInterruptApplication
1. WritedownthenameofType3interrupt.
2. Whereinmemoryinterrupt-pointertableisstoredfor8086?Drawthestructureofit.
3. Onwhichmemorylocations,theInterruptpointertableisstored?Whatistheuseofit?
4. Listoutanytwowaysoftakinginputfromkeyboardandgiveexampleofboth.
5. Howtoclearscreenandsetthecursorusinginterrupt?Describescreenfeaturesindetail.
6. WhatistheuseofTYPE2andTYPE3interrupts?
7. DefineBIOSKeyboarddataarea.WhatistheuseofINT16Hinterrupt?
8. Draw8086interrupt-pointertable.Explain8086interruptsandinterruptresponses.
9. Explain09H,02Hand40HfunctionsforscreendisplayofINT21Hwithexample.
10. Whatistheuseof09HfunctionofINT21h?
11. WritedownthenamesofType0andType1interrupt.
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BabuMadhavInstituteofInformationTechnology,UTU
12. Howmuchmemorydoesinterruptpointertableoccupy?Whatisthestartingaddressof
TYPE3interrupt?
13. ListoutanyfunctionsofINT21Hforscreeninterruptandgiveexampleofboth.
14. Explain8086interrupttypesindetail.
15. WhatisBIOSkeyboarddataarea?Explaininterruptfortakinginputfromkeyboard.
Unit6:ProgrammablePeripheralDevices
1. WhatisthechipnumberforprogrammableinterruptcontrollerandDMAcontroller?
2. Drawinternalblockdiagramof8255Aprogrammableparallelportdevice.
3. Writeshortnoteon8251–Programmableinterfacedevice–SerialI/O.
4. Listoutmodulesof8251-ProgrammableInterfacedevice.Whatistheuseofdatabuffer
module?
5. Writeshortnoteon8259-ProgrammableInterruptController.
6. Howmanyinterruptlinesareavailablein8259-ProgrammableInterruptController?Canit
handlenonmaskableinterrupts?
7. Writeshortnoteon8237-DMAController.
8. Listoutmodeof8255-ProgrammablePeripheralInterfaceandwriteuseofallmodes.