HT45F4N datasheet(29/170 Pages) HOLTEK

29 / 170 page

Rev. 1.30

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Rev. 1.30

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HT45F4N/HT45FH4N

Power Bank Flash MCU

HT45F4N/HT45FH4N

Power Bank 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

mov a,0Fh

; initialise high table pointer

mov tbhp,a

tabrd tempreg1

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

; memory address “F06H” transferred to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrd tempreg2

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

; memory address “F05H” transferred to tempreg2 and TBLH in this

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

; register tempreg2

org F00h

; sets initial address of program memory

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

In Circuit Programming

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientandeasy

upgradesandmodificationstotheirprogramsonthesamedevice.Asanadditionalconvenience,

Holtekhasprovidedameansofprogrammingthemicrocontrollerin-circuitusinga4-pininterface.

Thisprovidesmanufacturerswiththepossibilityofmanufacturingtheircircuitboardscompletewith

aprogrammedorun-programmedmicrocontroller,andthenprogrammingorupgradingtheprogram

atalaterstage.Thisenablesproductmanufacturerstoeasilykeeptheirmanufacturedproducts

suppliedwiththelatestprogramreleaseswithoutremovalandre-insertionofthedevice.

TheHoltekFlashMCUtoWriterProgrammingPincorrespondencetableisasfollows:

Holtek Write Pins

MCU Programming Pins

Function

ICPDA

PA�

P�og�a��ing Se�ial Data/Add�ess

ICPCK

PA7

P�og�a��ing Se�ial Clo�k

VDD

Powe� Supply

VSS

G�ound

Duringtheprogrammingprocess,theusermusttakecaretoensurethatnootheroutputsare

connectedtothesetwopins.

TheProgramMemoryandEEPROMdatamemorycanbothbeprogrammedseriallyin-circuitusing

this4-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditional

linefortheclock.Twoadditionallinesarerequiredforthepowersupply.Thetechnicaldetails

regardingthein-circuitprogrammingofthedevicearebeyondthescopeofthisdocumentandwill

besuppliedinsupplementaryliterature.

HT45F4N Datasheet(PDF) 29 Page - Holtek Semiconductor Inc

HT45F4N Datasheet(HTML) 29 Page - Holtek Semiconductor Inc

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