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HT45R4U 数据表(PDF) 31 Page - Holtek Semiconductor Inc |
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HT45R4U 数据表(HTML) 31 Page - Holtek Semiconductor Inc |
31 / 105 page Rev. 1.10 30 �a��� 1�� �01� Rev. 1.10 31 �a��� 1�� �01� 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. |
类似零件编号 - HT45R4U |
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类似说明 - HT45R4U |
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