HT45F75 datasheet(116/190 Pages) HOLTEK

116 / 190 page

Rev. 1.10

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Rev. 1.10

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Bit3

MLS:SPIDatashiftorder

0:LSB

1:MSB

Thisisthedatashiftselectbitandisusedtoselecthowthedataistransferred,either

MSBorLSBfirst.SettingthebithighwillselectMSBfirstandlowforLSBfirst.

Bit2

CSEN:SPISCSpinControl

0:Disable

1:Enable

TheCSENbitisusedasanenable/disablefortheSCSpin.Ifthisbitislow,thenthe

SCSpinwillbedisabledandplacedintoafloatingcondition.IfthebitishightheSCS

pinwillbeenabledandusedasaselectpin.

NotethatusingtheCSENbitcanbedisabledorenabledviaconfigurationoption.

Bit1

WCOL:SPIWriteCollisionflag

0:Nocollision

1:Collision

TheWCOLflagisusedtodetectifadatacollisionhasoccurred.Ifthisbitishighit

meansthatdatahasbeenattemptedtobewrittentotheSIMDregisterduringadata

transferoperation.Thiswritingoperationwillbeignoredifdataisbeingtransferred.

Thebitcanbeclearedbytheapplicationprogram.NotethatusingtheWCOLbitcan

bedisabledorenabledviaconfigurationoption.

Bit0

TRF:SPITransmit/ReceiveCompleteflag

0:Dataisbeingtransferred

1:SPIdatatransmissioniscompleted

TheTRFbitistheTransmit/ReceiveCompleteflagandissethighautomaticallywhen

anSPIdatatransmissioniscompleted,butmustclearedtozerobytheapplication

program.Itcanbeusedtogenerateaninterrupt.

SPI Communication

AftertheSPIinterfaceisenabledbysettingtheSIMENbithigh,thenintheMasterMode,when

dataiswrittentotheSIMDregister,transmission/receptionwillbeginsimultaneously.Whenthe

datatransferiscomplete,theTRFflagwillbesetautomatically,butmustbeclearedusingthe

applicationprogram.IntheSlaveMode,whentheclocksignalfromthemasterhasbeenreceived,

anydataintheSIMDregisterwillbetransmittedandanydataontheSDIpinwillbeshiftedinto

theSIMDregister.ThemastershouldoutputanSCSsignaltoenabletheslavedevicebeforea

clocksignalisprovided.Theslavedatatobetransferredshouldbewellpreparedattheappropriate

momentrelativetotheSCSsignaldependingupontheconfigurationsoftheCKPOLBbitandCKEG

bit.TheaccompanyingtimingdiagramshowstherelationshipbetweentheslavedataandSCSsignal

forvariousconfigurationsoftheCKPOLBandCKEGbits.

TheSPIwillcontinuetofunctionevenintheIDLEMode.

HT45F75 Datasheet(PDF) 116 Page - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 116 Page - Holtek Semiconductor Inc

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