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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F2020 데이터시트(PDF) 26 Page - Holtek Semiconductor Inc |
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HT45F2020 데이터시트(HTML) 26 Page - Holtek Semiconductor Inc |
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26 / 85 page  Rev. 1.00 26 April 11, 2017 Rev. 1.00 27 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU NORMAL Mode Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhasallof itsfunctionsoperationalandwherethesystemclockisprovidedbythehighspeedoscillators.This modeoperatesallowingthemicrocontrollertooperatenormallywithaclocksourcewillcomefrom thehighspeedoscillatorsHIRC.Thehighspeedoscillatorwillhoweverfirstbedividedbyaratio rangingfrom1to64,theactualratiobeingselectedbytheCKS2~CKS0bitsintheSCCregister. Althoughahighspeedoscillatorisused,runningthemicrocontrolleratadividedclockratioreduces theoperatingcurrent. SLOW Mode Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslowerspeed clocksource.TheclocksourceusedwillbefromfSUB.ThefSUBclockisderivedfromtheLIRC oscillator.Runningthemicrocontrollerinthismodeallowsittorunwithmuchloweroperating currents. SLEEP Mode TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENand FSIDENbitarelow.IntheSLEEPmodetheCPUwillbestopped,andthefSUBclocktoperipheral willbestoppedtoo,buttheWatchdogTimerfunctionisdecidedbyuserapplication. IDLE0 Mode TheIDLE0ModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENbitin theSCCregisterislowandtheFSIDENbitintheSCCregisterishigh.IntheIDLE0Modethe CPUwillbeswitchedoffbutthelowspeedoscillatorwillbeturnedontodrivesomeperipheral functions. IDLE1 Mode TheIDLE1ModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENbitinthe SCCregisterishighandtheFSIDENbitintheSCCregisterishigh.IntheIDLE1ModetheCPU willbeswitchedoffbutboththehighandlowspeedoscillatorswillbeturnedontoprovideaclock sourcetokeepsomeperipheralfunctionsoperational. IDLE2 Mode TheIDLE2ModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENbitinthe SCCregisterishighandtheFSIDENbitintheSCCregisterislow.IntheIDLE2ModetheCPU willbeswitchedoffbutthehighspeedoscillatorwillbeturnedontoprovideaclocksourcetokeep someperipheralfunctionsoperational. |
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