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HT82B42R Datasheet(PDF) 63 Page - Holtek Semiconductor Inc |
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HT82B42R Datasheet(HTML) 63 Page - Holtek Semiconductor Inc |
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63 / 86 page  Rev. 1.00 62 October 27, 2011 Rev. 1.00 63 October 27, 2011 HT82B42R/HT82B42RE I/O MCU with USB Interface SBEN=1 write data into SBDR WCOL=1? clear WCOL Y transmission completed? (TRF=1?) N Y read data from SBDR clear TRF transfer finished? N Y END master or slave master slave A A SPI transfer Configure CSEN and MLS M1 M0=11 M1 M0 = 00,01,10 Setup CKS FSPI=Fsys/1,/2 SPI Transfer Control Flowchart SPI Bus Enable/Disable ToenabletheSPIbus,setSBEN=1,CSEN=1andSCS=0,thenwaitfordatatobewrittenintothe SBDR(TXRXbuffer)register.FortheMasterMode,afterdatahasbeenwrittentotheSBDR(TXRX buffer)register,thentransmissionorreceptionwillstartautomatically.Whenallthedatahasbeen transferredtheTRFbitshouldbeset.FortheSlaveMode,whenclockpulsesarereceivedonSCK, dataintheTXRXbufferwillbeshiftedoutordataonSDIwillbeshiftedin. ToDisabletheSPIbusSCK,SDI,SDO,SCSshouldbeinafloatingcondition. |
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