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HT45R4U 数据表(PDF) 31 Page - Holtek Semiconductor Inc

部件名 HT45R4U
功能描述  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
Download  105 Pages
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制造商  HOLTEK [Holtek Semiconductor Inc]
网页  http://www.holtek.com
标志 HOLTEK - Holtek Semiconductor Inc

HT45R4U 数据表(HTML) 31 Page - Holtek Semiconductor Inc

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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
Pin-shared Functions
Theflexibilityofthemicrocontrollerrangeisgreatlyenhancedbytheuseofpinsthathavemore
thanonefunction.Limitednumbersofpinscanforceseriousdesignconstraintsondesignersbutby
supplyingpinswithmulti-functions,manyofthesedifficultiescanbeovercome.Forsomepins,the
chosenfunctionofthemulti-functionI/Opinsissetbyconfigurationoptionswhileforothersthe
functionissetbyapplicationprogramcontrol.
External Interrupt Inputs
TheexternalinterruptpinsINT0,INT1arepin-sharedwiththeI/OpinsPA2andPA7respectively.
Forapplicationsnotrequiringanexternalinterruptinput,thepin-sharedexternalinterruptpincanbe
usedasanormalI/Opin,howevertodothis,theexternalinterruptenablebitsintheINTC0register
mustbedisabled.
External Timer Clock Input
TheexternaltimerpinsTMR0,TMR1andTMR2arepin-sharedwithI/Opins.Toconfigurethemto
operateastimerinputs,thecorrespondingcontrolbitsinthetimercontrolregistermustbecorrectly
setandthepinmustalsobesetupasaninput.NotethattheoriginalI/Ofunctionwillremainevenif
thepinissetuptobeusedasanexternaltimerinput.
PFD Output
ThedevicecontainsaPFDfunctionwhosesingleoutputispin-sharedwithI/OpinPA3.The
outputfunctionofthispinischosenviaaconfigurationoptionandremainsfixedafterthedeviceis
programmed.Notethatthecorrespondingbitoftheportcontrolregister,PAC.3,mustsetupthepin
asanoutputtoenablethePFDoutput.IfthePACportcontrolregisterhassetupthepinasaninput,
thenthepinwillfunctionasanormallogicinputwiththeusualpull-highselection,evenifthePFD
configurationoptionhasbeenselected.
A/D Inputs
Thedevicecontainsamulti-channelA/Dconverterinputs.Alloftheseanaloginputsarepin-
sharedwithI/Opins.IfthesepinsaretobeusedasA/DinputsandnotasnormalI/Opinsthenthe
correspondingbitsintheA/DConverterChannelEnableRegister,ACER,mustbeproperlyset.There
arenoconfigurationoptionsassociatedwiththeA/Dfunction.IfusedasI/Opins,thenfullpull-high
resistorregisterremain,howeverifusedasA/Dinputsthenanypull-highresistorselectionsassociated
withthesepinswillbeautomaticallydisconnected.


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