HT45F65 datasheet(38/231 Pages) HOLTEK

38 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

RAM Data Memory

TheDataMemoryisavolatileareaof8-bitwideRAMinternalmemoryandisthelocationwhere

temporaryinformationisstored.Dividedintothreesections,thefirstoftheseisanareaofRAM

wherespecialfunctionregistersarelocated.Theseregistershavefixedlocationsandarenecessary

forcorrectoperationofthedevices.

Manyoftheseregisterscanbereadfromandwrittentodirectlyunderprogramcontrol,however,some

remainprotectedfromusermanipulation.ThesecondareaofDataMemoryisreservedforgeneral

purposeuse.Alllocationswithinthisareaarereadandwriteaccessibleunderprogramcontrol.The

thirdareaisreservedfortheLCDMemory.ThisspecialareaofDataMemoryismappeddirectlyto

theLCDdisplaysodatawrittenintothismemoryareawilldirectlyaffectthedisplayeddata.

TheaddressesoftheLCDMemoryareaoverlapthoseintheGeneralPurposeDataMemoryarea.

SwitchingbetweenthedifferentDataMemorybanksisachievedbysettingtheBankPointertothe

correctvalue.

Device

Capacity

Banks

HT��F6�

��6×8

0: 80H~FFH

1: 80H~97F

�: 80H~FFH

HT��F66

HT��F67

�1�×8

0: 80H~FFH

1: 80H~9FH

�: 80H~FFH

3: 80H~FFH

�: 80H~FFH

Structure

TheDataMemoryissubdividedintoseveralbanks,allofwhichareimplementedin8-bitwide

RAM.TheDataMemorylocatedinBank0issubdividedintotwosections,theSpecialPurpose

DataMemoryandtheGeneralPurposeDataMemory.

ThestartaddressoftheDataMemoryforthedeviceistheaddress00H.Registerswhichare

commontoallmicrocontrollers,suchasACC,PCL,etc.,havethesameDataMemoryaddress.The

LCDMemoryismappedintoBank1.TheotherbankscontainonlyGeneralPurposeDataMemory

forthedevice.AstheSpecialPurposeDataMemoryregistersaremappedintoallbankareas,they

cansubsequentlybeaccessedfromanybanklocation.

80 H

9F H

FF H

B ank 0

B ank 1

B ank 2

B ank 3

B ank 4

80 H

97 H

FF H

B ank 0

B ank 1

B ank 2

HT 45F 66/ HT 45F 67

HT 45F 65

General Purpose Data Memory

HT45F65 Datasheet(PDF) 38 Page - Holtek Semiconductor Inc

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