HT45F65 datasheet(29/231 Pages) HOLTEK

29 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit 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

mov tblp, a

; is referenced

mov a, 07h

; initialise high table pointer

mov tbhp, a

tabrd tempreg1

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

; memory address 7F06H 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 7F05H transferred to tempreg2 and TBLH in this

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

; register tempreg2

org 7F00h

; 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 Writer Pins

MCU Programming Pins

Pin Description

ICPDA

PA0

P�og�a��ing Se�ial Data/Add�ess

ICPCK

RES

P�og�a��ing Clock and Device Reset

VDD

Powe� Supply

VSS

G�ound

TheProgramMemorycanbeprogrammedseriallyin-circuitusingthis4-wireinterface.Data

isdownloadedanduploadedseriallyonasinglepinwithanadditionallinefortheclock.Two

additionallinesarerequiredforthepowersupply.Thetechnicaldetailsregardingthein-circuit

programmingofthedevicesarebeyondthescopeofthisdocumentandwillbesuppliedin

supplementaryliterature.

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