HT45F5R datasheet(27/138 Pages) HOLTEK

27 / 138 page

Rev. 1.10

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

RAM Data Memory

TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere

temporaryinformationisstored.

Structure

Dividedintotwotypes,thefirstoftheseisanareaofRAM,knownastheSpecialFunctionData

Memory.Herearelocatedregisterswhicharenecessaryforcorrectoperationofthedevice.Many

oftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however,some

remainprotectedfromusermanipulation.ThesecondareaofDataMemoryisknownastheGeneral

PurposeDataMemory,whichisreservedforgeneralpurposeuse.Alllocationswithinthisareaare

readandwriteaccessibleunderprogramcontrol.

TheoverallDataMemoryissubdividedintotwobanks.TheSpecialPurposeDataMemoryregisters

addressedfrom00H~7FHinDataMemoryarecommonandaccessibleinBank0andtheEEC

registerattheaddress40HinBank1.SwitchingbetweenthedifferentDataMemorybanksis

achievedbysettingtheBankPointertothecorrectvalue.ThestartaddressoftheDataMemoryfor

thedeviceistheaddress00H.

Special Purpose Data Memory

General Purpose Data Memory

Available Banks

Banks

Capacity

Banks

0�1

Bank 0: 00H~7FH

Bank 1: 40H (EEC)

1�8×8

Bank 0: 80H~FFH

Data Memory Summary

00H

80H

FFH

Spe�ial Pu�pose

Data Me�o�y

Gene�al Pu�pose

Data Me�o�y

Bank 0

Bank 1

40H

7FH

Data Memory Structure

General Purpose Data Memory

Allmicrocontrollerprogramsrequireanareaofread/writememorywheretemporarydatacanbe

storedandretrievedforuselater.ItisthisareaofRAMmemorythatisknownasGeneralPurpose

DataMemory.ThisareaofDataMemoryisfullyaccessiblebytheuserprogramingforbothreading

andwritingoperations.Byusingthebitoperationinstructionsindividualbitscanbesetorreset

underprogramcontrolgivingtheuseralargerangeofflexibilityforbitmanipulationintheData

Memory.

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