HT45FM2C datasheet(23/171 Pages) HOLTEK

23 / 171 page

Rev. 1.10

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Rev. 1.10

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HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Preliminar�

In Circuit Programming

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientand

easyupgradesandmodificationstotheirprogramsonthesamedevice.

Asanadditionalconvenience,Holtekhasprovidedameansofprogrammingthemicrocontroller

in-circuitusinga5-pininterface.Thisprovidesmanufacturerswiththepossibilityofmanufacturing

theircircuitboardscompletewithaprogrammedorun-programmedmicrocontroller,andthen

programmingorupgradingtheprogramatalaterstage.Thisenablesproductmanufacturerstoeasily

keeptheirmanufacturedproductssuppliedwiththelatestprogramreleaseswithoutremovaland

re-insertionofthedevice.

MCU Programming Pins

Function

PA0

Serial Data Input/Output

PA�

Serial Clock

PB0

In Circuit Programming �ode Set

VDD

Power Suppl�

VSS

Ground

TheProgramMemoryandEEPROMdatamemorycanbothbeprogrammedseriallyin-circuitusing

this5-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditional

linefortheclock.Twoadditionallinesarerequiredforthepowersupplyandincircuitprogramming

Modeset.Thetechnicaldetailsregardingtheincircuitprogrammingofthedeviceisbeyondthe

scopeofthisdocumentandwillbesuppliedinsupplementaryliterature.

DuringtheprogrammingprocessthePB0pinwillbeusedtosettheincircuitprogramingModeand

takingcontrolofthePA0andPA2I/Opinsfordataandclockprogrammingpurposes.Theusermust

theretakecaretoensurethatnootheroutputsareconnectedtothesetwopins.

Wr it er _V DD

IC PM S

IC PD A

IC PC K

Wr it er _V SS

To o t her C ir cu it

PA 0

PA 2

VS S

PB 0

VD D

Wr it er C onnec to r

Si g nal s

MC U Pr og ra mm in g

Pi ns

Note:*mayberesistororcapacitor.Theresistanceof*mustbe

greaterthan1kΩorthecapacitanceof*mustbelessthan1nF.

Programmer Pin

MCU Pins

ICP�S

PB0

ICPDA

PA0

ICPCK

PA�

Programmer and MCU Pins

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