HT66F4530 datasheet(56/224 Pages) HOLTEK

56 / 224 page

Rev. 1.00

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Rev. 1.00

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

FAST Mode

Asthenamesuggeststhisisoneofthemainoperatingmodeswherethemicrocontrollerhasallof

itsfunctionsoperationalandwherethesystemclockisprovidedbyoneofthehighspeedoscillators.

Thismodeoperatesallowingthemicrocontrollertooperatenormallywithaclocksourcewillcome

fromoneofthehighspeedoscillators,eithertheHXTorHIRCoscillators.Thehighspeedoscillator

willhoweverfirstbedividedbyaratiorangingfrom1to64,theactualratiobeingselectedby

theCKS2~CKS0bitsintheSCCregister.Althoughahighspeedoscillatorisused,runningthe

microcontrolleratadividedclockratioreducestheoperatingcurrent.

SLOW Mode

Thisisalsoamodewherethemicrocontrolleroperatesnormallyalthoughnowwithaslowerspeed

clocksource.TheclocksourceusedwillbefromfSUB.ThefSUBclockisderivedfromeitherthe

LIRCorLXToscillatordeterminedbytheFSSbitintheSCCregister.

SLEEP Mode

TheSLEEPModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENand

FSIDENbitarelow.IntheSLEEPmodetheCPUwillbestopped.ThefSUBclockprovidedtothe

peripheralfunctionwillalsobestopped,too.HoweverthefLIRCclockstillcontinuestooperateifthe

WDTfunctionisenabled.

IDLE0 Mode

TheIDLE0ModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENbitin

theSCCregisterislowandtheFSIDENbitintheSCCregisterishigh.IntheIDLE0Modethe

CPUwillbeswitchedoffbutthelowspeedoscillatorwillbeturnedontodrivesomeperipheral

functions.

IDLE1 Mode

TheIDLE1ModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENbitinthe

SCCregisterishighandtheFSIDENbitintheSCCregisterishigh.IntheIDLE1ModetheCPU

willbeswitchedoffbutboththehighandlowspeedoscillatorswillbeturnedontoprovideaclock

sourcetokeepsomeperipheralfunctionsoperational.

IDLE2 Mode

TheIDLE2ModeisenteredwhenanHALTinstructionisexecutedandwhentheFHIDENbitinthe

SCCregisterishighandtheFSIDENbitintheSCCregisterislow.IntheIDLE2ModetheCPU

willbeswitchedoffbutthehighspeedoscillatorwillbeturnedontoprovideaclocksourcetokeep

someperipheralfunctionsoperational.

Control Registers

Theregisters,SCC,HIRCC,HXTCandLXTC,areusedtocontrolthesystemclockandthe

correspondingoscillatorconfigurations.

Name

Bit

SCC

CKS�

CKS1

CKS0

—

FHS

FSS

FHIDEN FSIDEN

HIRCC

—

HIRC1

HIRC0

HIRCF

HIRCEN

HXTC

—

HXTM

HXTF

HXTEN

LXTC

—

LXTF

LXTEN

System Operating Mode Control Registers List

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