HT45FM2C datasheet(35/171 Pages) HOLTEK

35 / 171 page

Rev. 1.10

�4

�a� �0� �01�

Rev. 1.10

�5

�a� �0� �01�

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Preliminar�

Oscillator

Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious

applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest

optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation

areselectedthroughacombinationofconfigurationoptionsandregisters.

Oscillator Overview

Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources

fortheWatchdogTimerandTimeBaseInterrupt.Fullyintegratedinternaloscillators,requiringno

externalcomponents,areprovidedtoformawiderangeofbothfastandslowsystemoscillators.

Thehigherfrequencyoscillatorprovideshigherperformancebutcarrywithitthedisadvantageof

higherpowerrequirements,whiletheoppositeisofcoursetrueforthelowerfrequencyoscillators.

Withthecapabilityofdynamicallyswitchingbetweenfastandslowsystemclock,thisdevicehave

theflexibilitytooptimizetheperformance/powerratio,afeatureespeciallyimportantinpower

sensitiveportableapplications.

Type

Name

Freq.

Internal High Speed RC

HIRC

�0�Hz

Internal Low Speed RC

LIRC

��kHz

Oscillator Types

System Clock Configurations

Therearetwomethodsofgeneratingthesystemclock,ahighspeedoscillatorandalowspeed

oscillator.Thehighspeedoscillatoristheinternal20MHzRCoscillator.Thelowspeedoscillatoris

theinternal32kHzRCoscillator.Selectingwhethertheloworhighspeedoscillatorisusedasthe

systemoscillatorisimplementedusingtheHLCLKbitandCKS2~CKS0bitsintheSMODregister

andasthesystemclockcanbedynamicallyselected.

HIRC

LIRC

High Speed

Oscillation

Low Speed

Oscillation

fH/64

fH/32

fH/16

fH/8

fH/4

fH/2

6-stage Prescaler

fSUB

fSYS

HLCLK,

CKS2~CKS0 bits

System Clock Configurations

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