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HT66F20 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 59 Page - Holtek Semiconductor Inc |
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59 / 298 page  Rev. 1.90 58 �e���a�� 18� �01� Rev. 1.90 59 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM System Operation Modes Therearesixdifferentmodesofoperationforthemicrocontroller,eachonewithitsown specialcharacteristicsandwhichcanbechosenaccordingtothespecificperformanceand powerrequirementsoftheapplication.Therearetwomodesallowingnormaloperationofthe microcontroller,theNORMALModeandSLOWMode.Theremainingfourmodes,theSLEEP0, SLEEP1,IDLE0andIDLE1ModeareusedwhenthemicrocontrollerCPUisswitchedoffto conservepower. Operating Mode Description CPU fSYS fSUB fS fTBC NORMAL Mode On fH~fH/64 On On On SLOW Mode On fL On On On IDLE0 Mode Off Off On On/Off On IDLE1 Mode Off On On On On SLEEP0 Mode Off Off Off Off Off SLEEP1 Mode Off Off On On Off • NORMALMode Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhas allofitsfunctionsoperationalandwherethesystemclockisprovidedbyoneofthehigh speedoscillators.Thismodeoperatesallowingthemicrocontrollertooperatenormallywitha clocksourcewillcomefromoneofthehighspeedoscillators,eithertheHXT,ERCorHIRC oscillators.Thehighspeedoscillatorwillhoweverfirstbedividedbyaratiorangingfrom1to 64,theactualratiobeingselectedbytheCKS2~CKS0andHLCLKbitsintheSMODregister. Althoughahighspeedoscillatorisused,runningthemicrocontrolleratadividedclockratio reducestheoperatingcurrent. • SLOWMode Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslower speedclocksource.Theclocksourceusedwillbefromoneofthelowspeedoscillators,either theLXTortheLIRC.Runningthemicrocontrollerinthismodeallowsittorunwithmuchlower operatingcurrents.IntheSLOWMode,thefHisoff. • SLEEP0Mode TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbit intheSMODregisterislow.IntheSLEEP0modetheCPUwillbestopped,andthefSUBand fSclockswillbestoppedtoo,andtheWatchdogTimerfunctionisdisabled.Inthismode,the LVDENismustsetto0.IftheLVDENissetto"1",itwontentertheSLEEP0Mode. • SLEEP1Mode TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitin theSMODregisterislow.IntheSLEEP1modetheCPUwillbestopped.HoweverthefSUBand fSclockswillcontinuetooperateiftheLVDENis"1"ortheWatchdogTimerfunctionisenabled andifitsclocksourceischosenviaconfigurationoptiontocomefromthefSUB. |
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