HT68F005 datasheet(32/93 Pages) HOLTEK

32 / 93 page

Rev. 1.00

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Rev. 1.00

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HT68F005/HT68F006

Enhanced I/O Flash Type MCU

HT68F005/HT68F006

Enhanced I/O Flash Type MCU

System Operation Modes

Therearesixdifferentmodesofoperationforthemicrocontroller,eachonewithitsown

specialcharacteristicsandwhichcanbechosenaccordingtothespecificperformanceand

powerrequirementsoftheapplication.Therearetwomodesallowingnormaloperationofthe

microcontroller,theNORMALModeandSLOWMode.Theremainingfourmodes,theSLEEP0,

SLEEP1,IDLE0andIDLE1ModeareusedwhenthemicrocontrollerCPUisswitchedoffto

conservepower.

Operation Mode

Description

CPU

fSYS

fLIRC/fTBC

N�RMAL Mode

�n

fH~fH/64

�n

SL�W Mode

�n

IDLE0 Mode

�ff

�n

IDLE1 Mode

�ff

�n

SLEEP0 Mode

�ff

SLEEP1 Mode

�ff

�n

• NORMALMode

Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhas

allofitsfunctionsoperationalandwherethesystemclockisprovidedbyoneofthehighspeed

oscillators.Thismodeoperatesallowingthemicrocontrollertooperatenormallywithaclock

sourcewillcomefromoneofthehighspeedoscillators,eithertheHXTorHIRCoscillators.

Thehighspeedoscillatorwillhoweverfirstbedividedbyaratiorangingfrom1to64,theactual

ratiobeingselectedbytheCKS2~CKS0andHLCLKbitsintheSMODregister.Althoughahigh

speedoscillatorisused,runningthemicrocontrolleratadividedclockratioreducestheoperating

current.

• SLOWMode

Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslower

speedclocksource.Theclocksourceusedwillbefromthelowspeedoscillator,namelyLIRC.

Runningthemicrocontrollerinthismodeallowsittorunwithmuchloweroperatingcurrents.In

theSLOWMode,fHisoff.

• SLEEP0Mode

TheSLEEPModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitin

theSMODregisterislow.IntheSLEEP0modetheCPUwillbestopped,andthefLIRCclockwill

bestoppedtoo,andtheWatchdogTimerfunctionisdisabled.

• SLEEP1Mode

TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhenthebit,IDLEN,

intheSMODregisterislow.IntheSLEEP1modetheCPUwillbestopped.HoweverthefLIRC

clockwillcontinuetooperateiftheWatchdogTimerisenabled.

• IDLE0Mode

TheIDLE0ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitin

theSMODregisterishighandtheFSYSONbitintheCTRLregisterislow.IntheIDLE0Mode

thesystemoscillatorwillbeinhibitedfromdrivingtheCPUbutsomeperipheralfunctionswill

remainoperationalsuchastheTimeBaseandTMs.IntheIDLE0Mode,thesystemoscillator

willbestopped.

HT68F005 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

HT68F005 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc

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