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HT45F77 Datasheet(PDF) 69 Page - Holtek Semiconductor Inc |
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HT45F77 Datasheet(HTML) 69 Page - Holtek Semiconductor Inc |
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69 / 203 page  Rev. 1.20 �8 De�e��e� 1�� 201� Rev. 1.20 �9 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU Input/Output Ports HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput designationofeverypinfullyunderuserprogramcontrol,pull-highselectionsforallportsand wake-upselectionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa widerangeofapplicationpossibilities. Thedeviceprovidesbidirectionalinput/outputlineslabeledwithportnamesPA~PE.TheseI/O portsaremappedtotheRAMDataMemorywithspecificaddressesasshownintheSpecialPurpose DataMemorytable.AlloftheseI/Oportscanbeusedforinputandoutputoperations.Forinput operation,theseportsarenon-latching,whichmeanstheinputsmustbereadyattheT2risingedge ofinstruction"MOVA,[m]",wheremdenotestheportaddress.Foroutputoperation,allthedatais latchedandremainsunchangeduntiltheoutputlatchisrewritten. I/O Register List Register Name Bit 7 6 5 4 3 2 1 0 PAWU D7 D� D5 D� D3 D2 D1 D0 PAPU D7 D� D5 D� D3 D2 D1 D0 PA D7 D� D5 D� D3 D2 D1 D0 PAC D7 D� D5 D� D3 D2 D1 D0 PBPU — — — D� D3 D2 D1 D0 PB — — — D� D3 D2 D1 D0 PBC — — — D� D3 D2 D1 D0 PCPU D7 D� D5 D� D3 D2 D1 — PC D7 D� D5 D� D3 D2 D1 — PCC D7 D� D5 D� D3 D2 D1 — PDPU D7 D� D5 D� D3 D2 D1 D0 PD D7 D� D5 D� D3 D2 D1 D0 PDC D7 D� D5 D� D3 D2 D1 D0 PEPU D7 D� D5 D� D3 D2 D1 D0 PE D7 D� D5 D� D3 D2 D1 D0 PEC D7 D� D5 D� D3 D2 D1 D0 Pull-high Resistors Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor.These pull-highresistorsareselectedusingregistersPAPU~PEPU,andareimplementedusingweak PMOStransistors. PAPU Register Bit 7 6 5 4 3 2 1 0 Na�e D7 D� D5 D� D3 D2 D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 0 0 0 0 Bit7~0 PortAbit7~bit0Pull-highControl 0:Disable 1:Enable |
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