HT67F488 datasheet(23/171 Pages) HOLTEK

23 / 171 page

Rev. 1.60

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Table Read Program Example

tempreg1 db ?

; temporary register #1 in current page

tempreg2 db ?

; temporary register #2 in current page

mov a,06h

; initialise low 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 “F06H” transferred 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 “F05H” transferred to tempreg2

; and TBLH

; in this example the data “1AH” is transferred to tempreg1 and

; data “0FH” to register tempreg2 while the value “00H” will be

; transferred the high byte register TBLH

org 0F00h

; 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

PA�

P�og�a��ing Clock

VDD

Powe� Supply

VSS

G�ound

TheProgramMemoryandEEPROMdataMemorycanbothbeprogrammedseriallyin-circuitusing

this4-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditional

linefortheclock.Twoadditionallinesarerequiredforthepowersupply.Thetechnicaldetails

regardingthein-circuitprogrammingofthedevicesarebeyondthescopeofthisdocumentandwill

besuppliedinsupplementaryliterature.

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