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HT46R002 датащи(PDF) 36 Page - Holtek Semiconductor Inc

номер детали HT46R002
подробное описание детали  Cost-Effective A/D 8-Bit OTP MCU
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R002 датащи(HTML) 36 Page - Holtek Semiconductor Inc

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Rev. 1.21
36
April 11, 2017
Rev. 1.21
37
April 11, 2017
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
HT46R002/HT46R003
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
inputbysettingthePAC2bitinthePortControlRegister.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 (for HT46R003)
ThePFDfunctionoutputispin-sharedwithanI/Opin.Theoutputfunctionofthispinischosen
usingtheCTRL0register.Notethatthecorrespondingbitoftheportcontrolregistermustbeset
thepinasanoutputtoenablethePFDoutput.Iftheportcontrolregisterhassetthepinasaninput,
thenthepinwillfunctionasanormallogicinputwiththeusualpull-highselection,evenifthePFD
functionhasbeenselected.
PWM Output
ForthedevicesthePWMfunctionisincluded.ThePWMfunctionwhoseoutputsarepin-shared
withI/Opins.ThePWMoutputfunctionsarechosenusingtheCTRL0register.Notethatthe
correspondingbitoftheportcontrolregisters,fortheoutputpin,mustsetupthepinasanoutput
toenablethePWMoutput.Ifthepinsaresetupasinputs,thenthepinwillfunctionasanormal
logicinputwiththeusualpull-highselections,evenifthePWMregistershaveenabledthePWM
function.
A/D Iutput
ThedeviceshavefourinputstotheA/Dconverter.Alloftheseanaloginputsarepin-sharedwithI/O
pins.IfthesepinsaretobeusedasA/DinputsandnotasI/Opins,thenthecorrespondingPCRnbits
intheA/Dconvertercontrolregister,ADCR,mustbeproperlysetup.IfchosenasI/Opins,thenfull
pull-highresistorcontrolremains,howeverifusedasA/Dinputsthenanypull-highresistorcontrol
associatedwiththesepinswillbeautomaticallydisconnected.


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