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HT68F005 Datasheet(PDF) 49 Page - Holtek Semiconductor Inc |
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HT68F005 Datasheet(HTML) 49 Page - Holtek Semiconductor Inc |
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49 / 93 page  Rev. 1.00 48 ��to�e� ��� �01� Rev. 1.00 49 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type MCU Input/Output Ports HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput designationofeverypinfullyunderuserprogramcontrol,pull-highselectionsforallportsand wake-upselectionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa widerangeofapplicationpossibilities. Thedevicesprovidebidirectionalinput/outputlineslabeledwithportnamesPA.ThisI/Oportis mappedtotheRAMDataMemorywithspecificaddressesasshownintheSpecialPurposeData Memorytable.TheI/Oportcanbeusedforinputandoutputoperations.Forinputoperation,these portsarenon-latching,whichmeanstheinputsmustbereadyattheT2risingedgeofinstruction “MOVA,[m]”,wheremdenotestheportaddress.Foroutputoperation,allthedataislatchedand remainsunchangeduntiltheoutputlatchisrewritten. I/O Register Lists Register Name Bit 7 6 5 4 3 2 1 0 PAWU D7 D6 D5 D4 D3 D� D1 D0 PAPU D7 D6 D5 D4 D3 D� D1 D0 PAC D7 D6 D5 D4 D3 D� D1 D0 PA D7 D6 D5 D4 D3 D� D1 D0 PRM PRMS7 PRMS6 PRMS5 PRMS4 PRMS3 PRMS� PRMS1 PRMS0 Pull-high Resistors Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor. Thepull-highresistorisselectedusingregister,PAPU,andisimplementedusingweakPMOS transistors. PAPU Register Bit 7 6 5 4 3 2 1 0 Name D7 D6 D5 D4 D3 D� D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W P�R 0 0 0 0 0 0 0 0 Bit7~0 I/OPortAbit7~bit0Pull-highControl 0:Disable 1:Enable |
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