HT68F003 datasheet(21/119 Pages) HOLTEK

21 / 119 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

RAM Data Memory

TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere

temporaryinformationisstored.

Structure

Dividedintotwosections,thefirstoftheseisanareaofRAM,knownastheSpecialFunctionData

Memory.Herearelocatedregisterswhicharenecessaryforcorrectoperationofthedevice.Many

oftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however,some

remainprotectedfromusermanipulation.ThesecondareaofDataMemoryisknownastheGeneral

PurposeDataMemory,whichisreservedforgeneralpurposeuse.Alllocationswithinthisareaare

readandwriteaccessibleunderprogramcontrol.

TheoverallDataMemoryissubdividedintotwobanks.TheSpecialPurposeDataMemoryregisters

areaccessibleinallbanks,withtheexceptionoftheEECregisterataddress40H,whichisonly

accessibleinBank1.SwitchingbetweenthedifferentDataMemorybanksisachievedbysettingthe

BankPointertothecorrectvalue.ThestartaddressoftheDataMemoryforalldevicesistheaddress

00H.

General Purpose Data Memory

Thereis64×8bytesofgeneralpurposedatamemorywhicharearrangedin40H~7FHofBank0and

Bank1.Allmicrocontrollerprogramsrequireanareaofread/writememorywheretemporarydata

canbestoredandretrievedforuselater.ItisthisareaofRAMmemorythatisknownasGeneral

PurposeDataMemory.ThisareaofDataMemoryisfullyaccessiblebytheuserprogramingfor

bothreadingandwritingoperations.Byusingthebitoperationinstructionsindividualbitscanbeset

orresetunderprogramcontrolgivingtheuseralargerangeofflexibilityforbitmanipulationinthe

DataMemory.

Special Purpose Data Memory

This area of Data Memory is where registers, necessary for the correct operation of the

microcontroller,arestored.Mostoftheregistersarebothreadableandwriteablebutsomeare

protectedandarereadableonly,thedetailsofwhicharelocatedundertherelevantSpecialFunction

Registersection.Notethatforlocationsthatareunused,anyreadinstructiontotheseaddresseswill

returnthevalue"00H".

Device

Capacity

Bank 0

Bank 1

HT68F002

HT68F0025

HT68F003

64×8

40H~7FH

40H EEC register only

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