HT45F75 datasheet(113/190 Pages) HOLTEK

113 / 190 page

Rev. 1.10

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Da ta B us

SD I Pi n

SD O Pi n

SI MD

Tx /R x Sh i ft R egi st er

Bu sy

St at us

TR F Fl ag

WC OL F la g

Cl oc k

Ed ge /P ol ar it y

Co nt ro l

Cl oc k

So ur ce S el ec t

f SY S

f SU B

TM 0 CCRP m at ch fr equen cy/ 2

SC K Pi n

SC S Pi n

CS EN b it

CK EN b it

C KPO LB b it

SPI Block Diagram

SPI Interface Operation

TheSPIinterfaceisafullduplexsynchronousserialdatalink.Itisafourlineinterfacewithpin

namesSDI,SDO,SCKandSCS.PinsSDIandSDOaretheSerialDataInputandSerialDataOutput

lines,SCKistheSerialClocklineandSCSistheSlaveSelectline.AstheSPIinterfacepinsarepin-

sharedwithnormalI/OpinsandwiththeI2Cfunctionpins,theSPIinterfacemustfirstbeenabled

bysettingthecorrectbitsintheSIMC0andSIMC2registers.TheSPIcanbedisabledorenabled

usingtheSIMENbitintheSIMC0register.CommunicationbetweendevicesconnectedtotheSPI

interfaceiscarriedoutinaslave/mastermodewithalldatatransferinitiationsbeingimplemented

bythemaster.TheMasteralsocontrolstheclocksignal.AsthedeviceonlycontainsasingleSCS

pinonlyoneslavedevicecanbeutilized.TheSCSpiniscontrolledbysoftware,setCSENbitto"1"

toenableSCSpinfunction,setCSENbitto"0"theSCSpinwillbefloatingstate.

SP I M ast er

SP I S l ave

SC K

SD O

SD I

SC S

SC K

SD I

SD O

SC S

SPI Master/Slave Connection

TheSPIfunctioninthisdeviceoffersthefollowingfeatures:

• Fullduplexsynchronousdatatransfer

• BothMasterandSlavemodes

• LSBfirstorMSBfirstdatatransmissionmodes

• Transmissioncompleteflag

• Risingorfallingactiveclockedge

ThestatusoftheSPIinterfacepinsisdeterminedbyanumberoffactorssuchaswhetherthedevice

isinthemasterorslavemodeandupontheconditionofcertaincontrolbitssuchasCSENand

SIMEN.

HT45F75 Datasheet(PDF) 113 Page - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 113 Page - Holtek Semiconductor Inc

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