HT45F65 datasheet(41/231 Pages) HOLTEK

41 / 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

Bank Pointer – BP

TheProgramandDataMemoryaredividedintoseveralbanks.SelectingtherequiredProgramand

DataMemoryareaisachievedusingtheBankPointer.ForHT45F65,bits1~0ofBankPointeris

usedtoselectDataMemoryBanks0~2.ForHT45F66,bits5oftheBankPointerisusedtoselect

ProgramMemoryBanks0~1,whilebits0~2areusedtoselectDataMemoryBanks0~4.For

HT45F67,bits5~6oftheBankPointerisusedtoselectProgramMemoryBanks0~3,whilebits0~2

areusedtoselectDataMemoryBanks0~4.

TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthePower

DownMode,inwhichcase,theDataMemorybankremainsunaffected.Itshouldbenotedthatthe

SpecialFunctionDataMemoryisnotaffectedbythebankselection,whichmeansthattheSpecial

FunctionRegisterscanbeaccessedfromwithinanybank.DirectlyaddressingtheDataMemory

willalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer.Accessing

datafrombanksotherthanBank0mustbeimplementedusingIndirectaddressing.

AsboththeProgramMemoryandDataMemorysharethesameBankPointerRegister,caremustbe

takenduringprogramming.

BP Register (HT45F65)

Bit

�a�e

—

DMBP1

DMBP0

R/W

—

R/W

POR

—

Bit7~2

Unimplemented,readas"0"

Bit1~0

DMBP1~DMBP0:selectDataMemoryBanks

00:Bank0

01:Bank1

10:Bank2

11:undefined

BP Register (HT45F66)

Bit

�a�e

—

PMBP0

—

DMBP�

DMBP1

DMBP0

R/W

—

R/W

—

R/W

POR

—

Bit7~6

Unimplemented,readas"0"

Bit5

PMBP0:SelectProgramMemoryBanks

0:Bank0,ProgramMemoryAddressisfrom0000H~1FFFH

1:Bank1,ProgramMemoryAddressisfrom2000H~3FFFH

Tosuccessfullyjumptoanon-consecutiveprogrammemoryaddresslocatedin

differentprogrammemorybankusingthebranchinstructionsshcuas“JMP”or

“CALL”,theprogrammemorybankpointerbit,PMBP0,shouldfirstbeproperly

setupbeforethebranchinstructionsareexecuted.

Bit4~3

Unimplemented,readas"0"

Bit2~0

DMBP2~DMBP0:selectDataMemoryBanks

000:Bank0

001:Bank1

010:Bank2

011:Bank3

100:Bank4

110~111:Undefined

HT45F65 Datasheet(PDF) 41 Page - Holtek Semiconductor Inc

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