HT69F360 datasheet(64/235 Pages) HOLTEK

64 / 235 page

Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Operating Modes and System Clocks

Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill

demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially

trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill

bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce

currentconsumption.AsHoltekhasprovidedthesedeviceswithbothhighandlowspeedclock

sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof

theirmicrocontrollertoachievethebestperformance/powerratio.

System Clocks

TheseriesofdeviceshavemanydifferentclocksourcesforboththeCPUandperipheralfunction

operation.Byprovidingtheuserwithawiderangeofclockselectionsusingregistersprogramming,

aclocksystemcanbeconfiguredtoobtainmaximumapplicationperformance.

Themainsystemclock,cancomefromeitherahighfrequencyfHorlowfrequencyfSUBsource,

andisselectedusingtheCKS2~CKS0bitsintheSCCregister.Thehighspeedsystemclockcan

besourcedeitherfromtheHIRCortheHXToscillatorbyconfiguringtheFHSbit.Thelowspeed

systemclocksourcecanbesourcedfromeithertheLIRCoscillatororLXToscillatorbyconfiguring

theFSSbit.Theotherchoice,whichisadividedversionofthehighspeedsystemoscillatorhasa

rangeoffH/2~fH/64.

TheHXT,HIRCandLXToscillatorswillturnonbysettingtheirrelatedenablebitsHXTEN,

HIRCENandLXTEN.TheLIRCwillturnoffwhenCPUenterstheSLEEPModeandtheWDT

willturnoff.

HXT

HIRC

P�escale�

High Speed

Oscillato�s

Low Speed

Oscillato�s

fH/�

fH/1�

fH/�4

fH/�

fH/4

fH/3�

FHS

CKS�~CKS0

fSYS

fSUB

HXTE�

HIRCE�

÷�

LXT

LIRC

FSS

LXTE�

fSUB

WDT

LCD D�ive�

Ti�e �ase

TBCK

fSYS

Device Clock Configuration

Note:WhenthesystemclocksourcefSYSisswitchedtofSUBfromfH,thehighspeedoscillatorcan

bestoppedtoconservethepower.ThereforethereisnofH~fH/64,forperipheralcircuittouse,

whichisdeterminedbyconfiguringthecorrespondinghighspeedoscillatorenablecontrol

bit.

HT69F360 データシート(PDF) 64 Page - Holtek Semiconductor Inc

HT69F360 データシート(HTML) 64 Page - Holtek Semiconductor Inc

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