BS83A04A-3/BS83A04A-4
8-bit Touch Key Flash MCU
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Operating Mode Switching
Theꢀdeviceꢀcanꢀswitchꢀbetweenꢀoperatingꢀmodesꢀdynamicallyꢀallowingꢀtheꢀuserꢀtoꢀselectꢀtheꢀbestꢀ
performance/powerꢀratioꢀforꢀtheꢀpresentꢀtaskꢀinꢀhand.ꢀInꢀthisꢀwayꢀmicrocontrollerꢀoperationsꢀthatꢀ
doꢀnotꢀrequireꢀhighꢀperformanceꢀcanꢀbeꢀexecutedꢀusingꢀslowerꢀclocksꢀthusꢀrequiringꢀlessꢀoperatingꢀ
currentꢀandꢀprolongingꢀbatteryꢀlifeꢀinꢀportableꢀapplications.
Inꢀsimpleꢀterms,ꢀModeꢀSwitchingꢀbetweenꢀtheꢀNORMALꢀModeꢀandꢀSLOWꢀModeꢀisꢀexecutedꢀusingꢀtheꢀ
HLCLKꢀbitꢀandꢀCKS2~CKS0ꢀbitsꢀinꢀtheꢀSMODꢀregisterꢀwhileꢀModeꢀSwitchingꢀfromꢀtheꢀNORMAL/
SLOWꢀModesꢀtoꢀtheꢀSLEEP/IDLEꢀModesꢀisꢀexecutedꢀviaꢀtheꢀHALTꢀinstruction.ꢀWhenꢀaꢀHALTꢀ
instructionꢀisꢀexecuted,ꢀwhetherꢀtheꢀdeviceꢀentersꢀtheꢀIDLEꢀModeꢀorꢀtheꢀSLEEPꢀModeꢀisꢀdeterminedꢀbyꢀ
theꢀconditionꢀofꢀtheꢀIDLENꢀbitꢀinꢀtheꢀSMODꢀregisterꢀandꢀFSYSONꢀinꢀtheꢀCTRLꢀregister.
WhenꢀtheꢀHLCLKꢀbitꢀswitchesꢀtoꢀaꢀlowꢀlevel,ꢀwhichꢀimpliesꢀthatꢀclockꢀsourceꢀisꢀswitchedꢀfromꢀtheꢀ
highꢀspeedꢀclockꢀsource,ꢀfH,ꢀtoꢀtheꢀclockꢀsource,ꢀfH/2~fH/64ꢀorꢀfSUB.ꢀIfꢀtheꢀclockꢀisꢀfromꢀtheꢀfL,ꢀtheꢀ
highꢀspeedꢀclockꢀsourceꢀwillꢀstopꢀrunningꢀtoꢀconserveꢀpower.ꢀWhenꢀthisꢀhappensꢀitꢀmustꢀbeꢀnotedꢀ
thatꢀtheꢀfH/16ꢀandꢀfH/64ꢀinternalꢀclockꢀsourcesꢀwillꢀalsoꢀstopꢀrunning,ꢀwhichꢀmayꢀaffectꢀtheꢀoperationꢀ
ofꢀotherꢀinternalꢀfunctionsꢀsuchꢀasꢀtheꢀTimer/EventꢀCounter.ꢀTheꢀaccompanyingꢀflowchartꢀshowsꢀ
whatꢀhappensꢀwhenꢀtheꢀdeviceꢀmovesꢀbetweenꢀtheꢀvariousꢀoperatingꢀmodes.
Rev. 1.00
ꢄ7
�eꢀꢁꢂaꢁꢃ ꢄꢅꢆ ꢄ01ꢇ
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
