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HT45F77 Datasheet(PDF) 25 Page - Holtek Semiconductor Inc |
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HT45F77 Datasheet(HTML) 25 Page - Holtek Semiconductor Inc |
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25 / 203 page  Rev. 1.20 2� De�e��e� 1�� 201� Rev. 1.20 25 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU In Circuit Programming – ICP TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientandeasy upgradesandmodificationstotheirprogramsonthesamedevice.Asanadditionalconvenience, Holtekhasprovidedameansofprogrammingthemicrocontrollerin-circuitusinga4-pininterface. Thisprovidesmanufacturerswiththepossibilityofmanufacturingtheircircuitboardscompletewith aprogrammedorun-programmedmicrocontroller,andthenprogrammingorupgradingtheprogram atalaterstage.Thisenablesproductmanufacturerstoeasilykeeptheirmanufacturedproducts suppliedwiththelatestprogramreleaseswithoutremovalandre-insertionofthedevice. TheHoltekFlashMCUtoWriterProgrammingPincorrespondencetableisasfollows: Holtek Writer Pins MCU Programming Pins Pin Description ICPDA PA0 P�og�a��ing Se�ial Data/Add�ess ICPCK PA2 P�og�a��ing Clo�k VDD VDD Powe� Supply VSS VSS G�ound TheProgramMemorycanbeprogrammedseriallyin-circuitusingthis4-wireinterface.Data isdownloadedanduploadedseriallyonasinglepinwithanadditionallinefortheclock.Two additionallinesarerequiredforthepowersupply.Thetechnicaldetailsregardingthein-circuit programmingofthedevicearebeyondthescopeofthisdocumentandwillbesuppliedin supplementaryliterature. Duringtheprogrammingprocess,takingcontrolofthePA0andPA2pinsfordataandclock programmingpurposes.Theusermusttheretakecaretoensurethatnootheroutputsareconnected tothesetwopins. * * Wr it er _V DD IC PD A IC PC K Wr it er _V SS To o th er C ir cu it PA2 VSS PA 0 VD D Wr it er C onne ct or Si gnal s M CU Pr og ra mm in g Pi ns Note:*mayberesistororcapacitor.Theresistanceof*mustbegreaterthan1korthecapacitance of*mustbelessthan1nF. |
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