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HT66F319 데이터시트(PDF) 39 Page - Holtek Semiconductor Inc

부품명 HT66F319
상세설명  Enhanced A/D Flash MCU with EEPROM and UART
PDF  185 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F319 데이터시트(HTML) 39 Page - Holtek Semiconductor Inc

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Rev. 1.20
38
De�e��e� 0�� 201�
Rev. 1.20
39
De�e��e� 0�� 201�
HT66F319
Enhanced A/D Flash MCU with EEPROM and UART
HT66F319
Enhanced A/D Flash MCU with EEPROM and UART
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/�4
on
on
on
SLOW Mode
on
fSUB
on
on
on
IDLE0 Mode
off
off
on
on
on
IDLE1 Mode
off
on
on
on
on
SLEEP0 Mode
off
off
off
off
off
SLEEP1 Mode
off
off
on
on
off
NORMAL Mode
Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhasallof
itsfunctionsoperationalandwherethesystemclockisprovidedbyoneofthehighspeedoscillators.
Thismodeoperatesallowingthemicrocontrollertooperatenormallywithaclocksourcewillcome
fromoneofthehighspeedoscillators,eithertheHXTorHIRCoscillators.Thehighspeedoscillator
willhoweverfirstbedividedbyaratiorangingfrom1to64,theactualratiobeingselectedbythe
CKS2~CKS0andHLCLKbitsintheSMODregister.Althoughahighspeedoscillatorisused,
runningthemicrocontrolleratadividedclockratioreducestheoperatingcurrent.
SLOW Mode
Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslowerspeed
clocksource.Theclocksourceusedwillbefromoneofthelowspeedoscillators,eithertheLXT
ortheLIRC.Runningthemicrocontrollerinthismodeallowsittorunwithmuchloweroperating
currents.IntheSLOWMode,thefHisoff.
SLEEP0 Mode
TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitinthe
SMODregisterislow.IntheSLEEP0modetheCPUwillbestopped,andthefSUBandfSclockswill
bestoppedtoo,andtheWatchdogTimerfunctionisdisabled.Inthismode,theLVDENismustset
to"0".IftheLVDENissetto"1",itwon’tentertheSLEEP0Mode.
SLEEP1 Mode
TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitin
theSMODregisterislow.IntheSLEEP1modetheCPUwillbestopped.HoweverthefSUBandfS
clockswillcontinuetooperateiftheLVDENis"1"ortheWatchdogTimerfunctionisenabledwith
itsclocksourcecomingfromthefSUB.
IDLE0 Mode
TheIDLE0ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitinthe
SMODregisterishighandtheFSYSONbitintheCTRLregisterislow.IntheIDLE0Modethe
systemoscillatorwillbeinhibitedfromdrivingtheCPUbutsomeperipheralfunctionswillremain
operationalsuchastheWatchdogTimer,TMsandI2C.IntheIDLE0Mode,thesystemoscillator
willbestopped.



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