HT45F65 datasheet(171/231 Pages) HOLTEK

171 / 231 page

Rev. 1.60

170

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Rev. 1.60

171

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

Bit4

PCKEN:PCKOutputPinControl

0:Disable

1:Enable

Bit3~2

PCKP1~PCKP0:SelectPCKoutputpinfrequency

00:fSYS

01:fSYS/4

10:fSYS/8

11:TM0CCRPmatchfrequency/2

Bit1

SIMEN:SIMControl

0:Disable

1:Enable

Thebitistheoverallon/offcontrolfortheSIMinterface.WhentheSIMENbitis

clearedtozerotodisabletheSIMinterface,theSDI,SDO,SCKandSCS,orSDA

andSCLlineswillbeinafloatingconditionandtheSIMoperatingcurrentwillbe

reducedtoaminimumvalue.WhenthebitishightheSIMinterfaceisenabled.The

SIMconfigurationoptionmusthavefirstenabledtheSIMinterfaceforthisbittobe

effective.IftheSIMisconfiguredtooperateasanSPIinterfaceviatheSIM2~SIM0

bits,thecontentsoftheSPIcontrolregisterswillremainattheprevioussettingswhen

theSIMENbitchangesfromlowtohighandshouldthereforebefirstinitialisedby

theapplicationprogram.IftheSIMisconfiguredtooperateasanI2Cinterfaceviathe

SIM2~SIM0bitsandtheSIMENbitchangesfromlowtohigh,thecontentsoftheI2C

controlbitssuchasHTXandTXAKwillremainattheprevioussettingsandshould

thereforebefirstinitialisedbytheapplicationprogramwhiletherelevantI2Cflags

suchasHCF,HAAS,HBB,SRWandRXAKwillbesettotheirdefaultstates.

Bit0

Unimplemented,readas"0"

Interrupts

Interruptsareanimportantpartofanymicrocontrollersystem.Whenanexternaleventoran

internalfunctionsuchasaTimerModuleoranA/Dconverterrequiresmicrocontrollerattention,

theircorrespondinginterruptwillenforceatemporarysuspensionofthemainprogramallowingthe

microcontrollertodirectattentiontotheirrespectiveneeds.Thedevicecontainsseveralexternal

interruptandinternalinterruptsfunctions.Theexternalinterruptsaregeneratedbytheactionofthe

externalINT0~INT1andPINTBpins,whiletheinternalinterruptsaregeneratedbyvariousinternal

functionssuchastheTMs,TimeBase,LVD,SIM,SPI1andtheA/Dconverter.

Interrupt Registers

Overallinterruptcontrol,whichbasicallymeansthesettingofrequestflagswhencertain

microcontrollerconditionsoccurandthesettingofinterruptenablebitsbytheapplication

program,iscontrolledbyaseriesofregisters,locatedintheSpecialPurposeDataMemory.The

numberofregistersdependsuponthedevicechosenbutfallintothreecategories.Thefirstisthe

INTC0~INTC2registerswhichsetuptheprimaryinterrupts,thesecondistheMFI0~MFI3registers

whichsetuptheMulti-functioninterrupts.FinallythereisanINTEGregistertosetuptheexternal

interrupttriggeredgetype.

Eachregistercontainsanumberofenablebitstoenableordisableindividualregistersaswellas

interruptflagstoindicatethepresenceofaninterruptrequest.Thenamingconventionofthese

followsaspecificpattern.Firstislistedanabbreviatedinterrupttype,thenthe(optional)numberof

thatinterruptfollowedbyeitheran"E"forenable/disablebitor"F"forrequestflag.

HT45F65 Datasheet(PDF) 171 Page - Holtek Semiconductor Inc

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