BS85B12-3/BS85C20-3/BS85C20-5
Touch Key Flash MCU with LCD/LED Driver
SPI Communication
AfterꢀtheꢀSPIꢀinterfaceꢀisꢀenabledꢀbyꢀsettingꢀtheꢀSIMENꢀbitꢀhigh,ꢀthenꢀinꢀtheꢀMasterꢀMode,ꢀwhenꢀ
dataꢀisꢀwrittenꢀtoꢀtheꢀSIMDꢀregister,ꢀtransmission/receptionꢀwillꢀbeginꢀsimultaneously.ꢀWhenꢀtheꢀdataꢀ
transferꢀisꢀcomplete,ꢀtheꢀTRFꢀflagꢀwillꢀbeꢀsetꢀautomatically,ꢀbutꢀmustꢀbeꢀclearedꢀusingꢀtheꢀapplicationꢀ
program.ꢀInꢀtheꢀSlaveꢀMode,ꢀwhenꢀtheꢀclockꢀsignalꢀfromꢀtheꢀmasterꢀhasꢀbeenꢀreceived,ꢀanyꢀdataꢀinꢀ
theꢀSIMDꢀregisterꢀwillꢀbeꢀtransmittedꢀandꢀanyꢀdataꢀonꢀtheꢀSDIꢀpinꢀwillꢀbeꢀshiftedꢀintoꢀtheꢀSIMDꢀ
register.ꢀTheꢀmasterꢀshouldꢀoutputꢀanꢀSCSꢀsignalꢀtoꢀenableꢀtheꢀslaveꢀdeviceꢀbeforeꢀaꢀclockꢀsignalꢀ
isꢀprovided.ꢀTheꢀslaveꢀdataꢀtoꢀbeꢀtransferredꢀshouldꢀbeꢀwellꢀpreparedꢀatꢀtheꢀappropriateꢀmomentꢀ
relativeꢀtoꢀtheꢀSCSꢀsignalꢀdependingꢀuponꢀtheꢀconfigurationsꢀofꢀtheꢀCKPOLBꢀbitꢀandꢀCKEGꢀbit.ꢀ
TheꢀaccompanyingꢀtimingꢀdiagramꢀshowsꢀtheꢀrelationshipꢀbetweenꢀtheꢀslaveꢀdataꢀandꢀSCSꢀsignalꢀforꢀ
variousꢀconfigurationsꢀofꢀtheꢀCKPOLBꢀandꢀCKEGꢀbits.
TheꢀSPIꢀwillꢀcontinueꢀtoꢀfunctionꢀevenꢀinꢀtheꢀIDLEꢀMode.
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SPI Slave Mode Timing CKEG=0
Rev. 1.20
125
�ꢀꢁꢀst 10ꢂ 2012
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
