HT66F019 datasheet(26/175 Pages) HOLTEK

26 / 175 page

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HT66F019

A/D Flash MCU with EEPROM

HT66F019

A/D Flash MCU with EEPROM

Data Memory

TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere

temporaryinformationisstored.

Structure

Dividedintotwoareas,thefirstoftheseisanareaofRAM,knownastheSpecialFunctionData

Memory.Herearelocatedregisterswhicharenecessaryforcorrectoperationofthedevice.Many

oftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however,some

remainprotectedfromusermanipulation.ThesecondareaofDataMemoryisknownastheGeneral

PurposeDataMemory,whichisreservedforgeneralpurposeuse.Alllocationswithinthisareaare

readandwriteaccessibleunderprogramcontrol.

TheoverallDataMemoryissubdividedintotwobanks.TheSpecialPurposeDataMemoryregistersare

accessibleinallbanks,withtheexceptionoftheEECregisterataddress40H,whichisonlyaccessible

inBank1.SwitchingbetweenthedifferentDataMemorybanksisachievedbysettingtheBankPointer

tothecorrectvalue.ThestartaddressoftheDataMemoryforthedeviceistheaddress00H.

Special Purpose Data Memory

General Purpose Data Memory

Located Banks

Capacity

Bank: Address

0~1: 00H~�FH ex�ept EEC �egiste�

(EEC@40H in Bank 1 only)

�56×8

0: 80H~FFH

1: 80H~FFH

00H

FFH

Spe�ial Pu�pose

Data Me�o�y

Gene�al Pu�pose

Data Me�o�y

Bank 0

EEC at 40H in Bank 1 only

Bank 1

�FH

80H

Data Memory Structure

General Purpose Data Memory

Allmicrocontrollerprogramsrequireanareaofread/writememorywheretemporarydatacanbe

storedandretrievedforuselater.ItisthisareaofRAMmemorythatisknownasGeneralPurpose

DataMemory.ThisareaofDataMemoryisfullyaccessiblebytheuserprogramingforbothreading

andwritingoperations.Byusingthebitoperationinstructionsindividualbitscanbesetorresetunder

programcontrolgivingtheuseralargerangeofflexibilityforbitmanipulationintheDataMemory.

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".

HT66F019 Datasheet(PDF) 26 Page - Holtek Semiconductor Inc

HT66F019 Datasheet(HTML) 26 Page - Holtek Semiconductor Inc

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