HT67F488 datasheet(42/171 Pages) HOLTEK

42 / 171 page

Rev. 1.60

4�

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

System Operation Modes

Therearesixdifferentmodesofoperationforthemicrocontroller,eachonewithitsown

specialcharacteristicsandwhichcanbechosenaccordingtothespecificperformanceand

powerrequirementsoftheapplication.Therearetwomodesallowingnormaloperationofthe

microcontroller,theNORMALModeandSLOWMode.Theremainingfourmodes,theSLEEP0,

SLEEP1,IDLE0andIDLE1ModeareusedwhenthemicrocontrollerCPUisswitchedoffto

conservepower.

Operating Mode

Description

CPU

fSYS

fSUB

fTBC

�ORMAL Mode

fH~fH/64

SLOW Mode

fSUB

IDLE0 Mode

Off

IDLE1 Mode

Off

SLEEP0 Mode

Off

SLEEP1 Mode

Off

NORMAL Mode

Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhasallof

itsfunctionsoperationalandwherethesystemclockisprovidedbyoneofthehighspeedoscillators.

Thismodeoperatesallowingthemicrocontrollertooperatenormallywithaclocksourcewillcome

fromthehighspeedoscillatorHIRC/HXT.Thehighspeedoscillatorwillhoweverfirstbedivided

byaratiorangingfrom1to64,theactualratiobeingselectedbytheCKS2~CKS0andHLCLK

bitsintheSMODregister.Althoughahighspeedoscillatorisused,runningthemicrocontrollerata

dividedclockratioreducestheoperatingcurrent.

SLOW Mode

Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslowerspeed

clocksource.Theclocksourceusedwillbefromoneofthelowspeedoscillators,eithertheLXT

ortheLIRC.Runningthemicrocontrollerinthismodeallowsittorunwithmuchloweroperating

currents.IntheSLOWMode,thefHisoff.

SLEEP0 Mode

TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitinthe

SMODregisterislow.IntheSLEEP0modetheCPUwillbestopped,andthefSUBclockwillbe

stoppedtoo,andtheWatchdogTimerfunctionisdisabled.Inthismode,theLVDENismustsetto“0”.

IftheLVDENissetto“1”,itwon’tentertheSLEEP0Mode.

SLEEP1 Mode

TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitinthe

SMODregisterislow.IntheSLEEP1modetheCPUwillbestopped.HoweverthefSUBclockwill

continuetooperateiftheLVDENis“1”ortheWatchdogTimerfunctionisenabled.

IDLE0 Mode

TheIDLE0ModeisenteredwhenaHALTinstructionisexecutedandwhentheIDLENbitinthe

SMODregisterishighandtheFSYSONbitintheCTRLregisterislow.IntheIDLE0Modethe

systemoscillatorwillbeinhibitedfromdrivingtheCPU,thesystemoscillatorwillbestopped,the

lowfrequencyclockfSUBwillbeon.

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