HT45F3520 datasheet(23/134 Pages) HOLTEK

23 / 134 page

Rev. 1.10

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Rev. 1.10

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HT45F3520/HT45F3530

Personal Care Flash MCU

HT45F3520/HT45F3530

Personal Care Flash MCU

Table Read Program Example

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

mov a,06h

; initialise low table pointer - note that this address is referenced

mov tblp,a

; to the last page or present page

tabrdl tempreg1

; transfers value in table referenced by table pointer data at program

; memory address "306H" transferred to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrdl tempreg2

; transfers value in table referenced by table pointer data at program

; memory address "305H" transferred to tempreg2 and TBLH in this

; example the data "1AH" is transferred to tempreg1 and data "0FH" to

; register tempreg2

org 300h

; sets initial address of program memory

dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

In Circuit Programming – ICP

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientandeasy

upgradesandmodificationstotheirprogramsonthesamedevice.Asanadditionalconvenience,

Holtekhasprovidedameansofprogrammingthemicrocontrollerin-circuitusinga4-pininterface.

Thisprovidesmanufacturerswiththepossibilityofmanufacturingtheircircuitboardscompletewith

aprogrammedorun-programmedmicrocontroller,andthenprogrammingorupgradingtheprogram

atalaterstage.Thisenablesproductmanufacturerstoeasilykeeptheirmanufacturedproducts

suppliedwiththelatestprogramreleaseswithoutremovalandre-insertionofthedevice.

TheHoltekFlashMCUtoWriterProgrammingPincorrespondencetableisasfollows:

Holtek Write Pins

MCU Programming Pins

Function

ICPDA

PA0

P�og�a��ing Se�ial Data/Ad�ess

ICPCK

PA�

P�og�a��ing Se�ial Clo�k

VDD

Powe� Supply

VSS

G�ound

TheProgramMemoryandEEPROMdatamemorycanbothbeprogrammedseriallyin-circuitusing

this4-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditional

linefortheclock.Twoadditionallinesarerequiredforthepowersupplyandground.Thetechnical

detailsregardingthein-circuitprogrammingofthedevicearebeyondthescopeofthisdocument

andwillbesuppliedinsupplementaryliterature.

Duringtheprogrammingprocess,takingcontroloftheICPDAandICPCKpinsfordataandclock

programmingpurposes.Theusermusttheretakecaretoensurethatnootheroutputsareconnected

tothesetwopins.

HT45F3520 Datasheet(PDF) 23 Page - Holtek Semiconductor Inc

HT45F3520 Datasheet(HTML) 23 Page - Holtek Semiconductor Inc

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