HT45F3W datasheet(119/167 Pages) HOLTEK

119 / 167 page

Rev. 1.50

118

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Rev. 1.50

119

De�e��e� 01� �01�

HT45F3W

R-Type Blood Pressure Meter Flash MCU

HT45F3W

R-Type Blood Pressure Meter Flash MCU

SPI1D Register

Bit

Na�e

D�

R/W

POR

"x" unknown

Bit7~0

D7~D0:SPI1Serialbusdataregister

SPI Communication

AftertheSPIinterfaceisenabledbysettingtheSPInENbithigh,thenintheMasterMode,when

dataiswrittentotheSPInDregister,transmission/receptionwillbeginsimultaneously.Whenthe

datatransferiscomplete,theTRFnflagwillbesetautomatically,butmustbeclearedusingthe

applicationprogram.IntheSlaveMode,whentheclocksignalfromthemasterhasbeenreceived,

anydataintheSPInDregisterwillbetransmittedandanydataontheSnDIpinwillbeshiftedinto

theSPInDregister.ThemastershouldoutputanSnCSsignaltoenabletheslavedevicebeforea

clocksignalisprovided.Theslavedatatobetransferredshouldbewellpreparedattheappropriate

momentrelativetotheSnCSsignaldependingupontheconfigurationsoftheCKPOLBnbitand

CKEGnbit.Theaccompanyingtimingdiagramshowstherelationshipbetweentheslavedataand

SnCSsignalforvariousconfigurationsoftheCKPOLBnandCKEGnbits.TheSPIwillcontinueto

functionevenintheIDLEMode.

Sn CK ( CK PO LB n= 1, C KEG n= 0)

SP In EN , C SEN n= 1

SP In EN =1 , CS EN n= 0 (E xt er na l Pu ll -H ig h)

Sn CK ( C KPO LB n= 0, C KE Gn =0 )

Sn CK ( CK PO LB n= 1, C KE Gn =1 )

Sn CK ( CK PO LB n= 0, C KE Gn =1 )

Sn D O (C KEG n= 0)

Sn D O (C KEG n= 1)

Sn CS

Sn D I D at a Ca pt ur e

D 7/ D 0D 6/ D 1D 5/ D 2D 4/ D 3D 3/ D 4D 2/ D 5D 1/ D 6D 0/ D 7

Wr it e to S PI nD

SPIn Master Mode Timing (n=0 or 1)

Sn CK ( C KPO LB n= 1)

Sn CK ( C KPO LB n= 0)

Sn DO

Sn CS

Sn DI D at a Ca pt ur e

D7 /D 0D 6/ D1

D5 /D 2D 4/ D3

D3 /D 4D 2/ D5

D1 /D 6D 0/ D7

Wr it e to S PI nD

(S nD O does n o t ch ange unt il fi rs t Sn CK e dge )

SPIn Slave Mode Timing – CKEGn=0 (n=0 or 1)

HT45F3W Datasheet(PDF) 119 Page - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 119 Page - Holtek Semiconductor Inc

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