HT45F56 datasheet(17/90 Pages) HOLTEK

17 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

In Circuit Programming – ICP

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientand

easyupgradesandmodificationstotheirprogramsonthesamedevice.

Asanadditionalconvenience,Holtekhasprovidedameansofprogrammingthemicrocontrollerin-

circuitusinga4-pininterface.Thisprovidesmanufacturerswiththepossibilityofmanufacturing

theircircuitboardscompletewithaprogrammedorun-programmedmicrocontroller,andthen

programmingorupgradingtheprogramatalaterstage.Thisenablesproductmanufacturerstoeasily

keeptheirmanufacturedproductssuppliedwiththelatestprogramreleaseswithoutremovalandre-

insertionofthedevice.

Holtek Writer Pins

MCU Programming Pins

Pin Description

ICPDA

PA0

Programming Serial Data/Address

ICPCK

PA2

Programming Clock

VDD

Power Supply

VSS

Ground

TheProgramMemoryandEEPROMdatamemorycanbeprogrammedseriallyin-circuitusingthis

4-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditionalline

fortheclock.Twoadditionallinesarerequiredforthepowersupply.Thetechnicaldetailsregarding

thein-circuitprogrammingofthedevicearebeyondthescopeofthisdocumentandwillbesupplied

insupplementaryliterature.

Duringtheprogrammingprocess,theusermusttakecareoftheICPDAandICPCKpinsfordata

andclockprogrammingpurposestoensurethatnootheroutputsareconnectedtothesetwopins.

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 0

PA 2

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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