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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F2020 데이터시트(PDF) 38 Page - Holtek Semiconductor Inc |
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HT45F2020 데이터시트(HTML) 38 Page - Holtek Semiconductor Inc |
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38 / 85 page  Rev. 1.00 38 April 11, 2017 Rev. 1.00 39 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Input/Output Ports HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput designationofeverypinfullyunderuserprogramcontrol,pull-highselectionsforallportsand wake-upselectionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa widerangeofapplicationpossibilities. Thedeviceprovidesbidirectionalinput/outputlineslabeledwithportnamePA.TheseI/Oports aremappedtotheRAMDataMemorywithspecificaddressesasshownintheSpecialPurpose DataMemorytable.AlloftheseI/Oportscanbeusedforinputandoutputoperations.Forinput operation,theseportsarenon-latching,whichmeanstheinputsmustbereadyattheT2risingedge ofinstruction“MOVA,[m]”,wheremdenotestheportaddress.Foroutputoperation,allthedatais latchedandremainsunchangeduntiltheoutputlatchisrewritten. Register Name Bit 7 6 5 4 3 2 1 0 PA — — — — PA3 PA2 PA1 PA0 PAC — — — — PAC3 PAC2 PAC1 PAC0 PAPU — — — — PAPU3 PAPU2 PAPU1 PAPU0 PAWU — — — — PAWU3 PAWU2 PAWU1 PAWU0 I/O Logic Function Register List Pull-high Resistors Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor. Thesepull-highresistorsareselectedusingtherelevantpull-highcontrolregistersPAPU,andare implementedusingweakPMOStransistors.Notethatthepull-highresistorcanbecontrolledbythe relevantpull-highcontrolregistersonlywhenthepin-sharedfunctionalpinisselectedasadigital inputorNMOSoutput.Otherwise,thepull-highresistorscannotbeenabled. PAPU Register Bit 7 6 5 4 3 2 1 0 Name — — — — PAPU3 PAPU2 PAPU1 PAPU0 R/W — — — — R/W R/W R/W R/W POR — — — — 0 0 0 0 Bit7~4 Unimplemented,readas“0” Bit3~0 PAPU3~PAPU0:PortAbit3~bit0Pull-highControl 0:Disable 1:Enable |
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