HT45F65 datasheet(154/231 Pages) HOLTEK

154 / 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

Serial Interface Module – SIM

ThedevicescontainaSerialInterfaceModule,whichincludesboththefourlineSPIinterfaceand

thetwolineI2Cinterfacetypes,toallowaneasymethodofcommunicationwithexternalperipheral

hardware.Havingrelativelysimplecommunicationprotocols,theseserialinterfacetypesallowthe

microcontrollertointerfacetoexternalSPIorI2Cbasedhardwaresuchassensors,Flashmemory,

etc.TheSIMinterfacepinsarepin-sharedwithotherI/OpinsthereforetheSIMinterfacefunction

mustfirstbeselectedusingaconfigurationoption.Asbothinterfacetypessharethesamepinsand

registers,thechoiceofwhethertheSPIorI2CtypeisusedismadeusingtheSIMoperatingmode

controlbits,namedSIM2~SIM0,intheSIMC0register.Thesepull-highresistorsoftheSIMpin-

sharedI/Oareselectedusingpull-highcontrolregisters,andalsoiftheSIMfunctionisenabled.

SPI Interface

ThisSPIinterfacefunctionwhichiscontainedwithintheSerialInterfaceModule,shouldnotbe

confusedwiththeotherindependentSPIfunction,knownasSPI1,whichisdescribedinanother

sectionofthisdatasheet.TheSPIinterfaceisoftenusedtocommunicatewithexternalperipheral

devicessuchassensors,Flashmemorydevicesetc.OriginallydevelopedbyMotorola,thefour

lineSPIinterfaceisasynchronousserialdatainterfacethathasarelativelysimplecommunication

protocolsimplifyingtheprogrammingrequirementswhencommunicatingwithexternalhardware

devices.

Thecommunicationisfullduplexandoperatesasaslave/mastertype,wherethedevicecanbe

eithermasterorslave.AlthoughtheSPIinterfacespecificationcancontrolmultipleslavedevices

fromasinglemaster,butthisdeviceprovidedonlyoneSCSpin.Ifthemasterneedstocontrol

multipleslavedevicesfromasinglemaster,themastercanuseI/Opintoselecttheslavedevices.

SPI Interface Operation

TheSPIinterfaceisafullduplexsynchronousserialdatalink.Itisafourlineinterfacewithpin

namesSDI,SDO,SCKandSCS.PinsSDIandSDOaretheSerialDataInputandSerialDataOutput

lines,SCKistheSerialClocklineandSCSistheSlaveSelectline.AstheSPIinterfacepinsarepin-

sharedwithnormalI/OpinsandwiththeI2Cfunctionpins,theSPIinterfacemustfirstbeenabledby

selectingtheSIMenableconfigurationoptionandsettingthecorrectbitsintheSIMC0andSIMC2

registers.AftertheSPIconfigurationoptionhasbeenconfigureditcanalsobeadditionallydisabled

orenabledusingtheSIMENbitintheSIMC0register.Communicationbetweendevicesconnected

totheSPIinterfaceiscarriedoutinaslave/mastermodewithalldatatransferinitiationsbeing

implementedbythemaster.TheMasteralsocontrolstheclocksignal.Asthedeviceonlycontains

asingleSCSpinonlyoneslavedevicecanbeutilized.TheSCSpiniscontrolledbysoftware,set

CSENbitto"1"toenableSCSpinfunction,setCSENbitto"0"theSCSpinwillbefloatingstate.

SP I M ast er

SP I Sl av e

SC K

SD O

SD I

SC S

SC K

SD I

SD O

SC S

SPI Master/Slave Connection

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