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HT46R0042 Arkusz danych(PDF) 33 Page - Holtek Semiconductor Inc

Numer części HT46R0042
Szczegółowy opis  Cost-Effective A/D 8-Bit OTP MCU
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
Pin-shared Functions
Theflexibilityofthemicrocontrollerrangeisgreatlyenhancedbytheuseofpinsthathavemore
thanonefunction.Limitednumbersofpinscanforceseriousdesignconstraintsondesignersbutby
supplyingpinswithmulti-functions,manyofthesedifficultiescanbeovercome.Forsomepins,the
chosenfunctionofthemulti-functionI/Opinsissetbyapplicationprogramcontrol.
External Interrupt Input
Theexternalinterruptpin,INT,ispin-sharedwithanI/Opin.Tousethepinasanexternalinterrupt
inputthecorrectbitsintheINTC0registermustbeprogrammed.Thepinmustalsobesetasan
inputbysettingthePAC0bitinthePortControlRegister.Apull-highresistorcanalsobeselected
viatheappropriateportpull-highresistorregister.Notethatevenifthepinissetasanexternal
interruptinputtheI/Ofunctionstillremains.
External Timer/Event Counter Input
TheTimer/EventCounterpinTMRispin-sharedwithI/OpinsForthissharedpintobeusedas
Timer/EventCounterinput,theTimer/EventCountermustbeconfiguredtobeintheEventCounter
orPulseWidthCaptureMode.ThisisachievedbysettingtheappropriatebitsintheTimer/Event
CounterControlRegister.ThepinmustalsobesetasinputbysettingtheappropriatebitinthePort
ControlRegister.Pull-highresistoroptionscanalsobeselectedusingtheportpull-highresistor
registers.NotethatevenifthepinissetasanexternaltimerinputtheI/Ofunctionstillremains.
PFD Output
ThePFDfunctionoutputispin-sharedwithanI/Opin.Theoutputfunctionofthispinischosen
usingtheCTRL0register.Notethatthecorrespondingbitoftheportcontrolregistermustbeset
thepinasanoutputtoenablethePFDoutput.Iftheportcontrolregisterhassetthepinasaninput,
thenthepinwillfunctionasanormallogicinputwiththeusualpull-highselection,evenifthePFD
functionhasbeenselected.
PWM Output
ForthedevicethePWMfunctionisincluded.ThePWMfunctionwhoseoutputsarepin-shared
withI/Opins.ThePWMoutputfunctionsarechosenusingtheCTRL0register.Notethatthe
correspondingbitoftheportcontrolregisters,fortheoutputpin,mustsetupthepinasanoutput
toenablethePWMoutput.Ifthepinsaresetupasinputs,thenthepinwillfunctionasanormal
logicinputwiththeusualpull-highselections,evenifthePWMregistershaveenabledthePWM
function.
A/D Iutput
ThedevicehaseightinputstotheA/Dconverter.Alloftheseanaloginputsarepin-sharedwithI/
Opins.IfthesepinsaretobeusedasA/DinputsandnotasI/Opins,thenthecorrespondingPCRn
bitsintheA/Dconvertercontrolregister,ADCR1,mustbeproperlysetup.IfchosenasI/Opins,
thenfullpull-highresistorcontrolremains,howeverifusedasA/Dinputsthenanypull-highresistor
controlassociatedwiththesepinswillbeautomaticallydisconnected.
I/O Pin Structures
TheaccompanyingdiagramsillustratetheI/Opininternalstructures.Astheexactlogical
constructionoftheI/Opinmaydifferfromthesedrawings,theyaresuppliedasaguideonlyto
assistwiththefunctionalunderstandingoftheI/Opins.


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