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HT45F56 数据表(PDF) 47 Page - Holtek Semiconductor Inc |
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HT45F56 数据表(HTML) 47 Page - Holtek Semiconductor Inc |
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47 / 90 page  Rev. 1.11 46 April 11, 2017 Rev. 1.11 47 April 11, 2017 HT45F56 Shock Detector Flash MCU HT45F56 Shock Detector Flash MCU Input/Output Ports HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput designationofeverypinfullyunderuserprogramcontrol,pull-highselectionsforallportsand wake-upselectionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa widerangeofapplicationpossibilities. Thedeviceprovideabidirectionalinput/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 PA7 PA6 PA5 — — PA2 PA1 PA0 PAC PAC7 PAC6 PAC5 — — PAC2 PAC1 PAC0 PAPU PAPU7 PAPU6 PAPU5 — — PAPU2 PAPU1 PAPU0 PAWU PAWU7 PAWU6 PAWU5 — — PAWU2 PAWU1 PAWU0 I/O Registers List “—”:Unimplemented,readas“0”. PAn:PortADatabit 0:Data0 1:Data1 PACn:PortAPintypeselection 0:Output 1:Input PAPUn:PortAPinpull-highfunctioncontrol 0:Disable 1:Enable PAWUn:PortAPinwake-upfunctioncontrol 0:Disable 1:Enable Pull-high Resistors Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor.These pull-highresistorsareselectedusingtherelevantpull-highcontrolregistersandareimplemented usingweakPMOStransistors. |
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