HT69F240 datasheet(20/172 Pages) HOLTEK

20 / 172 page

Rev. 1.20

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Rev. 1.20

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HT69F240

I/O 8-Bit Flash MCU with LED/LCD Driver

HT69F240

I/O 8-Bit Flash MCU with LED/LCD Driver

Table Read Program Example

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

mov a,06h

; initialise table pointer - note that this address

; is referenced to the last page or present page

mov tblp, a

tabrdl tempreg1

; transfers value in table referenced by table pointer

; to tempreg1

; data at program memory address "0F06H" transferred to

; to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrdl tempreg2

; transfers value in table referenced by table pointer

; to tempreg2

; data at program memory address "0F05H" transferred to

; tempreg2 and TBLH

; in this example the data "1AH" is transferred to

; tempreg1 and data "0FH" to register tempreg2

; the value "00H" will be transferred to the high byte

; register TBLH

org 0F00h

; sets initial address of last page

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

In Circuit Programming – ICP

TheprovisionofFlashtypeProgramMemoryprovidestheuserwithameansofconvenientand

easyupgradesandmodificationstotheirprogramsonthesamedevice.

Asanadditionalconvenience,Holtekhasprovidedameansofprogrammingthemicrocontroller

in-circuitusinga4-pininterface.Thisprovidesmanufacturerswiththepossibilityofmanufacturing

theircircuitboardscompletewithaprogrammedorun-programmedmicrocontroller,andthen

programmingorupgradingtheprogramatalaterstage.Thisenablesproductmanufacturerstoeasily

keeptheirmanufacturedproductssuppliedwiththelatestprogramreleaseswithoutremovaland

re-insertionofthedevice.

Holtek Writer Pins

MCU Programming Pins

Pin Description

ICPDA

PA0

P�og�amming Se�ial Data/Add�ess

ICPCK

PA2

P�og�amming Clo�k

VDD

Powe� Supply

VSS

G�ound

TheProgramMemorycanbeprogrammedseriallyin-circuitusingthis4-wireinterface.Data

isdownloadedanduploadedseriallyonasinglepinwithanadditionallinefortheclock.Two

additionallinesarerequiredforthepowersupplyandonelineforthereset.Thetechnicaldetails

regardingthein-circuitprogrammingofthedevicesarebeyondthescopeofthisdocumentandwill

besuppliedinsupplementaryliterature.

HT69F240 Datasheet(PDF) 20 Page - Holtek Semiconductor Inc

HT69F240 Datasheet(HTML) 20 Page - Holtek Semiconductor Inc

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