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HT45R4U датащи(PDF) 49 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) 49 Page - Holtek Semiconductor Inc

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Rev. 1.10
48
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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
A/D Converter Control Register – ADCR0, ADCR1, ACER
TocontrolthefunctionandoperationoftheA/Dconverter,twocontrolregistersknownasADCR0
andADCR1areprovided.These8-bitregistersdefinefunctionssuchastheselectionofwhich
analogchannelisconnectedtotheinternalA/Dconverter,whichpinsareusedasanaloginputsand
whichareusedasnormalI/Os,theA/Dclocksourceaswellascontrollingthestartfunctionand
monitoringtheA/Dconverterendofconversionstatus.
TheACS2~ACS0bitsintheADCR0registerandACS4bitistheADCR1registerdefinetheADC
inputchannelnumber.Asthedevicecontainsonlyoneactualanalogtodigitalconverterhardware
circuit,eachoftheindividual8analoginputsmustberoutedtotheconverter.Itisthefunctionof
theACS4andACS2~ACS0bitstodeterminewhichanalogchannelinputpinsorinternal1.25Vis
actuallyconnectedtotheinternalA/Dconverter.
TheACERcontrolregistercontainstheACER7~ACER0bitswhichdeterminewhichpinsonPE0,
PA6andPB2~PB7areusedasanaloginputsfortheA/Dconverterinputandwhichpinsarenot
tobeusedastheA/Dconverterinput.SettingthecorrespondingbithighwillselecttheA/Dinput
function,clearingthebittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthe
pinisselectedtobeanA/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-shared
functionwillberemoved.Inaddition,anyinternalpull-highresistorsconnectedtothesepinswillbe
automaticallyremovedifthepinisselectedtobeanA/Dinput.
ADCR0 Register
Bit
7
6
5
4
3
2
1
0
Name
START
EOCB
ADOFF
ACS4
ACS�
ACS1
ACS0
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
POR
0
1
1
0
0
0
0
Bit7
START:StarttheA/Dconversion
0→1→0 :start
0→1
:resettheA/DconverterandsetEOCBto"1"
ThisbitisusedtoinitiateanA/Dconversionprocess.Thebitisnormallylowbutifset
highandthenclearedlowagain,theA/Dconverterwillinitiateaconversionprocess.
WhenthebitissethightheA/Dconverterwillbereset.
Bit6
EOCB:EndofA/Dconversionflag
0:A/Dconversionended
1:A/Dconversioninprogress
ThisreadonlyflagisusedtoindicatewhenanA/Dconversionprocesshascompleted.
Whentheconversionprocessisrunningthebitwillbehigh.
Bit5
ADOFF:ADCmodulepoweron/offcontrolbit
0:ADCmodulepoweron
1:ADCmodulepoweroff
ThisbitcontrolsthepowertotheA/Dinternalfunction.Thisbitshouldbecleared
tozerotoenabletheA/Dconverter.IfthebitissethighthentheA/Dconverterwill
beswitchedoffreducingthedevicepowerconsumption.AstheA/Dconverterwill
consumealimitedamountofpower,evenwhennotexecutingaconversion,thismay
beanimportantconsiderationinpowersensitivebatterypoweredapplications.
Note:1.itisrecommendedtosetADOFF=1beforeenteringIDLE/SLEEPModefor
savingpower.
2.ADOFF=1willpowerdowntheADCmodule.


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