HT66F007 datasheet(21/131 Pages) HOLTEK

21 / 131 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT66F007/HT66F008

Cost-Effective A/D Flash MCU with EEPROM

HT66F007/HT66F008

Cost-Effective A/D Flash MCU with EEPROM

On-Chip Debug Support – OCDS

TherearetwoEVchipsnamedHT66V007andHT66V008whichareusedtoemulatetheHT66F007

andHT66F008repectively.TheseEVchipdevicesalsoprovidean“On-ChipDebug”functionto

debugthedeviceduringthedevelopmentprocess.TheEVchipandtheactualMCUdevicesare

almostfunctionallycompatibleexceptforthe“On-ChipDebug”function.UserscanusetheEV

chipdevicetoemulatetherealchipdevicebehaviorbyconnectingtheOCDSDAandOCDSCK

pinstotheHoltekHT-IDEdevelopmenttools.TheOCDSDApinistheOCDSData/Addressinput/

outputpinwhiletheOCDSCKpinistheOCDSclockinputpin.WhenusersusetheEVchipfor

debugging,otherfunctionswhicharesharedwiththeOCDSDAandOCDSCKpinsintheactual

MCUdevicewillhavenoeffectintheEVchip.However,thetwoOCDSpinswhicharepin-shared

withtheICPprogrammingpinsarestillusedastheFlashMemoryprogrammingpinsforICP.Fora

moredetailedOCDSdescription,refertothecorrespondingdocumentnamed“Holteke-Linkfor8-bit

MCUOCDSUser’sGuide”.

Holtek e-Link Pins

EV Chip Pins

Pin Description

OCDSDA

On-chip Debug Support Data/Address input/output

OCDSCK

On-chip Debug Support Clock input

VDD

Power Supply

GND

VSS

Ground

RAM Data Memory

TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere

temporaryinformationisstored.

Structure

Dividedintotwosections,thefirstoftheseisanareaofRAM,knownastheSpecialFunctionData

Memory.Herearelocatedregisterswhicharenecessaryforcorrectoperationofthedevices.Many

oftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however,some

remainprotectedfromusermanipulation.ThesecondareaofDataMemoryisknownastheGeneral

PurposeDataMemory,whichisreservedforgeneralpurposeuse.Alllocationswithinthisareaare

readandwriteaccessibleunderprogramcontrol.

TheoverallDataMemoryissubdividedintotwobanks.TheSpecialPurposeDataMemoryregisters

areaccessibleinallbanks,withtheexceptionoftheEECregisterataddress40H,whichisonly

accessibleinBank1.SwitchingbetweenthedifferentDataMemorybanksisachievedbysetting

theBankPointertothecorrectvalue.ThestartaddressoftheDataMemoryforthedevicesisthe

address00H.

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