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HT45F77 Datasheet(PDF) 116 Page - Holtek Semiconductor Inc |
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HT45F77 Datasheet(HTML) 116 Page - Holtek Semiconductor Inc |
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116 / 203 page  Rev. 1.20 11� De�e��e� 1�� 201� Rev. 1.20 117 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU 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 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 TheSPIfunctioninthisdeviceoffersthefollowingfeatures: • Fullduplexsynchronousdatatransfer • BothMasterandSlavemodes • LSBfirstorMSBfirstdatatransmissionmodes • Transmissioncompleteflag • Risingorfallingactiveclockedge ThestatusoftheSPIinterfacepinsisdeterminedbyanumberoffactorssuchaswhetherthedeviceis inthemasterorslavemodeandupontheconditionofcertaincontrolbitssuchasCSENandSIMEN. SPI Registers TherearethreeinternalregisterswhichcontroltheoveralloperationoftheSPIinterface.Theseare theSIMDdataregisterandtworegistersSIMC0andSIMC2.NotethattheSIMC1registerisonly usedbytheI2Cinterface. Register Name Bit 7 6 5 4 3 2 1 0 SIMC0 SIM2 SIM1 SIM0 — SIMDBC1 SIMDBC0 SIMEN SIMICF SIMD D7 D� D5 D� D3 D2 D1 D0 SIMC2 D7 D� CKPOLB CKEG MLS CSEN WCOL TRF SIM Registers List TheSIMDregisterisusedtostorethedatabeingtransmittedandreceived.Thesameregisterisused byboththeSPIandI2Cfunctions.BeforethedevicewritesdatatotheSPIbus,theactualdatato betransmittedmustbeplacedintheSIMDregister.AfterthedataisreceivedfromtheSPIbus,the devicecanreaditfromtheSIMDregister.AnytransmissionorreceptionofdatafromtheSPIbus mustbemadeviatheSIMDregister. |
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