HT45F4MA datasheet(24/145 Pages) HOLTEK

24 / 145 page

Rev. 1.20

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Rev. 1.20

De�e��e� 1�� 201�

HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

In Circuit Programming

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientandeasy

upgradesandmodificationstotheirprogramsonthesamedevice.Asanadditionalconvenience,

Holtekhasprovidedameansofprogrammingthemicrocontrollerin-circuitusinga4-pininterface.

Thisprovidesmanufacturerswiththepossibilityofmanufacturingtheircircuitboardscompletewith

aprogrammedorun-programmedmicrocontroller,andthenprogrammingorupgradingtheprogram

atalaterstage.Thisenablesproductmanufacturerstoeasilykeeptheirmanufacturedproducts

suppliedwiththelatestprogramreleaseswithoutremovalandre-insertionofthedevice.

TheHoltekFlashMCUtoWriterProgrammingPincorrespondencetableisasfollows:

Holtek Writer Pins

MCU Programming Pins

Pin Description

ICPDA

PA�

P�og�a��ing Se�ial Data/Add�ess

ICPCK

PA7

P�og�a��ing Clo�k

VDD

Powe� Supply

VSS

G�ound

Duringtheprogrammingprocess,theusermusttakecaretoensurethatnootheroutputsare

connectedtothesetwopins.

TheProgramMemoryandEEPROMdatamemorycanbothbeprogrammedseriallyin-circuitusing

this4-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditional

linefortheclock.Twoadditionallinesarerequiredforthepowersupply.Thetechnicaldetails

regardingthein-circuitprogrammingofthedevicearebeyondthescopeofthisdocumentandwill

besuppliedinsupplementaryliterature.

Wr it er _V DD

IC PD A

IC PC K

Wr it er _V SS

To o th er C ir cu it

PA 6

PA7

VS S

VD D

Wr it er C onne ct or

Si gnal s

MC U Pr og ra mm in g

Pi ns

Note:*mayberesistororcapacitor.Theresistanceof*mustbegreaterthan1korthecapacitance

of*mustbelessthan1nF.

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