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HT45F39 Datasheet(PDF) 42 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 42 Page - Holtek Semiconductor Inc |
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42 / 102 page  Rev. 1.10 42 July 01, 2016 Rev. 1.10 43 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU Input/Output Ports HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput designationofeverypinfullyunderuserprogramcontrol,pull-highselectionsforallportsand wake-upselectionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa widerangeofapplicationpossibilities. Thedevicesprovidebidirectionalinput/outputlineslabeledwithportnamesPA~PB.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 PAWK D7 D6 D5 D4 D3 D2 D1 D0 PAPU D7 D6 D5 D4 D3 D2 D1 D0 PA D7 D6 D5 D4 D3 D2 D1 D0 PAC D7 D6 D5 D4 D3 D2 D1 D0 PB — — — — — D2 D1 D0 PBC — — — — — D2 D1 D0 PBPU — — — — — D2 D1 D0 Pull-high Resistors Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor.These pull-highresistorsareselectedusingregistersPAPU~PBPU,andareimplementedusingweak PMOStransistors. PAPU Register Bit 7 6 5 4 3 2 1 0 Name D7 D6 D5 D4 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 PAbit7~bit0Pull-HighControl 0:Disable 1:Enable PBPU Register Bit 7 6 5 4 3 2 1 0 Name — — — — — D2 D1 D0 R/W — — — — — R/W R/W R/W POR — — — — — 0 0 0 Bit7~3 "—":Unimplemented,readas"0" Bit2~0 PBbit2~bit0Pull-HighControl 0:Disable 1:Enable |
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