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HT45F5Q-2 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc |
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HT45F5Q-2 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 117 page  Rev. 1.00 3� ���� 0�� �01� Rev. 1.00 33 ���� 0�� �01� HT45F5Q-2 Charger Flash MCU HT45F5Q-2 Charger Flash MCU Operating Modes and System Clocks Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill bytheirnatureincreasecurrentconsumptionandofcourseviceversa,lowerspeedclocksreduce currentconsumption.AsHoltekhasprovidedthedevicewithbothhighandlowspeedclocksources andthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationoftheir microcontrollertoachievethebestperformance/powerratio. System Clocks ThedevicehasmanydifferentclocksourcesforboththeCPUandperipheralfunctionoperation.By providingtheuserwithawiderangeofclockoptionsusingregisterprogramming,aclocksystem canbeconfiguredtoobtainmaximumapplicationperformance. Themainsystemclock,cancomefromahighfrequency,fH,orlowfrequency,fSUB,source,and isselectedusingtheCKS2~CKS0bitsintheSCCregister.Thehighspeedsystemclockcanbe sourcedfromtheHIRCoscillator.ThelowspeedsystemclocksourcecanbesourcedfromtheLIRC oscillator.Theotherchoice,whichisadividedversionofthehighspeedsystemoscillatorhasa rangeoffH/2~fH/64. High Speed Osci��ator Presca�er HIRC fH fH/� fH/4 fH/8 fH/1� fH/3� fH/�4 CKS�~CKS0 fSYS Low Speed Osci��ator LIRC IDLE0 SLEEP IDLE� SLEEP fSUB fSUB fSUB fSYS/4 fSYS CLKSEL[1:0] fPSC Presca�er Time Base 0 Time Base 1 TB0ON TB1ON TB1[�:0] TB0[�:0] WDT fLIRC HIRCEN Device Clock Configurations Note:WhenthesystemclocksourcefSYSisswitchedtofSUBfromfH,thehighspeedoscillatorwill stoptoconservethepowerorcontinuetooscillatetoprovidetheclocksource,fH~fH/64,for peripheralcircuittouse,whichisdeterminedbyconfiguringthecorrespondinghighspeed oscillatorenablecontrolbit. |
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