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HT45R4U датащи(PDF) 27 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U датащи(HTML) 27 Page - Holtek Semiconductor Inc

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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
Interrupt Control Registers
These8-bitregisters,INTC0,INTC1,MFICandINTEDGE,controltheoperationofthedevice
interruptfunctions.Bysettingvariousbitswithintheseregistersusingstandardbitmanipulation
instructions,theenable/disablefunctionofeachinterruptcanbeindependentlycontrolled.Amaster
interruptbitwithintheINTC0register,theEMIbit,actslikeaglobalenable/disableandisusedto
setalloftheinterruptenablebitsonoroff.Thisbitisclearedwhenaninterruptroutineisenteredto
disablefurtherinterruptandissetbyexecutingthe"RETI"instruction.TheINTEDGEregisterisused
toselecttheactiveedgesforthetwoexternalinterruptpinsINT0andINT1.
Timer/Event Counter Registers
Thedevicecontainsthreeinternal8-bitTimer/EventCounters.TheregistersTMR0,TMR1andTMR2
arethelocationswherethetimervaluesarelocated.Theseregisterscanalsobepreloadedwithfixed
datatoallowdifferenttimeintervalstobesetup.Theassociatedcontrolregisters,TMR0C,TMR1C
andTMR2C,containthesetupinformationforthesetimers,whichdeterminesinwhatmodethetimer
istobeusedaswellascontainingthetimeron/offcontrolfunction.
Input/Output Ports and Control Registers
WithintheareaofSpecialFunctionRegisters,theI/Oregistersandtheirassociatedcontrolregisters
playaprominentrole.AllI/OportshaveadesignatedregistercorrespondinglylabeledasPA,
PB,PC,PDandPE.TheselabeledI/OregistersaremappedtospecificaddresseswithintheData
MemoryasshownintheDataMemorytable,whichareusedtotransfertheappropriateoutputor
inputdataonthatport.WitheachI/OportthereisanassociatedcontrolregisterlabeledPAC,PBC,
PCC,PDCandPECalsomappedtospecificaddresseswiththeDataMemory.Thecontrolregister
specifieswhichpinsofthatportaresetasinputsandwhicharesetasoutputs.Tosetupapinasan
input,thecorrespondingbitofthecontrolregistermustbesethigh,foranoutputitmustbesetlow.
Duringprograminitialization,itisimportanttofirstsetupthecontrolregisterstospecifywhich
pinsareoutputsandwhichareinputsbeforereadingdatafromorwritingdatatotheI/Oports.One
flexiblefeatureoftheseregistersistheabilitytodirectlyprogramsinglebitsusingthe″SET[m].i″
and″CLR[m].i″instructions.TheabilitytochangeI/Opinsfromoutputtoinputandviceversaby
manipulatingspecificbitsoftheI/Ocontrolregistersduringnormalprogramoperationisauseful
featureofthisdevice.
A/D Converter Registers – ADRL, ADRH, ADCR0, ADCR1, ACER
Thedevicecontainsamultiplechannels12-bitA/Dconverter.ThecorrectoperationoftheA/
Drequirestheuseoftwodataregistersandthreecontrolregisters.Thetwodataregisters,ahigh
bytedataregisterknownasADRH,andalowbytedataregisterknownasADRL,aretheregister
locationswherethedigitalvalueisplacedafterthecompletionofananalogtodigitalconversion
cycle.FunctionssuchastheA/Denable/disable,A/DchannelselectionandA/Dclockfrequencyare
determinedusingthethreecontrolregisters,ADCR0,ADCR1andACER.
Port A Wake-up Register − PAWU
AllpinsonPortAhaveawake-upfunctionenablealowgoingedgeonthesepinstowake-up
thedevicewhenitisinapowerdownmode.ThepinsonPortAthatareusedtohaveawake-up
functionareselectedusingthisresister.


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