HT45F3W datasheet(23/167 Pages) HOLTEK

23 / 167 page

Rev. 1.50

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HT45F3W

R-Type Blood Pressure Meter Flash MCU

HT45F3W

R-Type Blood Pressure Meter Flash MCU

Table Read Program Example

rombank 1 code1

ds .section ‘data’

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

code0 .section ‘code’

mov a,06h

; initialise table pointer - note that this address is referenced

mov tblp,a

; to the last page or the page that tbhp pointed

mov a,3fh

; initialise high table pointer

mov tbhp,a

; it is not necessary to set tbhp if executing tabrdl

tabrd tempreg1

tabrdl tempreg1

; transfers value in table referred by table pointer to tempreg1

; data at program memory address 3F06H transferred to

; tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrd tempreg2

tabrdl tempreg2

; transfers value in table referenced by table pointer to tempreg2

; data at program memory address 3F05H transferred to tempreg2

; and TBLH

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

; and data “0FH” to tempreg2

; the value “00H” will be transferred to the high byte register TBLH

code1 .section ‘code’

org 1F00h

; sets initial address of last page

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 Clo�k

VDD

Powe� Supply

VSS

G�ound

TheProgramMemoryandEEPROMdataMemorycanbothbeprogrammedseriallyin-circuitusing

this4-wireinterface.Dataisdownloadedanduploadedseriallyonasinglepinwithanadditional

linefortheclock.Twoadditionallinesarerequiredforthepowersupply.Thetechnicaldetails

HT45F3W Datasheet(PDF) 23 Page - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 23 Page - Holtek Semiconductor Inc

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