ETIC 2230 Guia do Utilizador descarregar pdf (Página 21)

Rev. 1.10 20 November 14, 2014 Rev. 1.10 21 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

In Circuit Programming – ICP

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientandeasy

upgradesandmodicationstotheirprogramsonthesamedevice.Asanadditionalconvenience,

Holtekhasprovidedameansofprogrammingthemicrocontrollerin-circuitusinga4-pininterface.

Thisprovidesmanufacturerswiththepossibilityofmanufacturingtheircircuitboardscompletewith

aprogrammedorun-programmedmicrocontroller,andthenprogrammingorupgradingtheprogram

atalaterstage.Thisenablesproductmanufacturerstoeasilykeeptheirmanufacturedproducts

suppliedwiththelatestprogramreleaseswithoutremovalandre-insertionofthedevice.

TheHoltekFlashMCUtoWriterProgrammingPincorrespondencetableisasfollows:

Holtek Write Pins MCU Programming Pins Function

ICPDA PA0

Programming Serial Data/Address

ICPCK PA2 Programming Clock

VDD VDD Power Supply

VSS VSS Ground

Duringtheprogrammingprocess,theusermusttheretakecaretoensurethatnootheroutputsare

connectedtothesetwopins.

TheProgramMemoryandEEPROMdatamemorycanbothbeprogrammedseriallyin-circuitusing

this4-wireinterface.Dataisdownloadedanduploadedserially/parallelonseveralpinswithan

additionallinefortheclock.Twoadditionallinesarerequiredforthepowersupply.Thetechnical

detailsregardingthein-circuitprogrammingofthedeviceisbeyondthescopeofthisdocumentand

willbesuppliedinsupplementaryliterature.

Duringtheprogrammingprocess,the ICPDAandICPCKpinsfordataandclockprogramming

purposes.Theusermusttheretakecaretoensurethatnootheroutputsareconnectedtothesetwo

pins.

* *

Writer_VDD

IC PDA

IC PCK

Writer_ VSS

To o th er C ir cuit

PA2

VSS

PA0

VDD

Writer C onnector

Signals

MCU Prog ra mmin g

Pins

Note:*mayberesistororcapacitor.Theresistanceof*mustbegreaterthan1korthecapacitance

of*mustbelessthan1nF.

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