HT45F77 datasheet(26/203 Pages) HOLTEK

26 / 203 page

Rev. 1.20

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HT45F77

Body Fat Scale Flash MCU

HT45F77

Body Fat Scale Flash MCU

On Chip Debug Support – OCDS

ThereisanEVchipnamedHT45V77whichisusedtoemulatetheHT45F77device.TheEV

chipdevicealsoprovidesan"On-ChipDebug"functiontodebugtherealMCUdeviceduringthe

developmentprocess.TheEVchipandtherealMCUdevicearealmostfunctionallycompatible

exceptfor"On-ChipDebug"function.UserscanusetheEVchipdevicetoemulatetherealchip

devicebehaviorbyconnectingtheOCDSDAandOCDSCKpinstotheHoltekHT-IDEdevelopment

tools.TheOCDSDApinistheOCDSData/Addressinput/outputpinwhiletheOCDSCKpinis

theOCDSclockinputpin.WhenusersusetheEVchipfordebugging,otherfunctionswhichare

sharedwiththeOCDSDAandOCDSCKpinsinthedevicewillhavenoeffectintheEVchip.

However,thetwoOCDSpinswhicharepin-sharedwiththeICPprogrammingpinsarestillused

astheFlashMemoryprogrammingpinsforICP.FormoredetailedOCDSinformation,refertothe

correspondingdocumentnamed"Holteke-Linkfor8-bitMCUOCDSUser’sGuide".

Holtek e-Link Pins

EV Chip Pins

Pin Description

OCDSDA

On-Chip De�ug Suppo�t Data/Add�ess input/output

OCDSCK

On-Chip De�ug Suppo�t Clo�k input

VDD

Powe� Supply

VSS

G�ound

In Application Programming – IAP

ThedeviceoffersIAPfunctiontoupdatedataorapplicationprogramtoFlashROM.Userscan

defineanyROMlocationforIAP,buttherearesomefeatureswhichusermustnoticeinusingIAP

function.

• Erasepage:32words/page

• Writing:32words/time

• Reading:1word/time

In Application Programming Control Register

TheAddressregisters,FARLandFARH,andtheDataregisters,FD0L/FD0H,FD1L/FD1H,FD2L/

FD2H,FD3L/FD3H,locatedinallDataMemorysectors,togetherwiththeControlregisters,FC0,

FC1andFC2,locatedinDataMemorysector1arethecorrespondingFlashaccessregistersfor

IAP.AsindirectaddressingistheonlywaytoaccesstheFC0,FC1andFC2registers,allreadand

writeoperationstotheregistersmustbeperformedusingtheIndirectAddressingRegister,IAR1or

IAR2,andtheMemoryPointerpair,MP1L/MP1HorMP2L/MP2H.BecausetheFC0,FC1andFC2

controlregistersarelocatedattheaddressof28H~2AHinDataMemorysector1,thedesiredvalue

rangedfrom28Hto2AHmustbewrittenintotheMP1LorMP2LMemoryPointerlowbyteandthe

value"01H"mustalsobewrittenintotheMP1HorMP2HMemoryPointerhighbyte.

HT45F77 Datasheet(PDF) 26 Page - Holtek Semiconductor Inc

HT45F77 Datasheet(HTML) 26 Page - Holtek Semiconductor Inc

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