HT45F12 datasheet(33/104 Pages) HOLTEK

33 / 104 page

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HT45F12

8-Bit Flash MCU with Op Amps & Comparators

HT45F12

8-Bit Flash MCU with Op Amps & Comparators

Oscillator

Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious

applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest

optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation

areselectedthroughregisters.

Oscillator Overview

Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources

fortheWatchdogTimerandTimeBasefunctions.Externaloscillatorsrequiringsomeexternal

componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents,

areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptions

areselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovidehigher

performancebutcarrywithitthedisadvantageofhigherpowerrequirements,whiletheopposite

isofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitching

betweenfastandslowsystemclock,thedevicehastheflexibilitytooptimizetheperformance/

powerratio,afeatureespeciallyimportantinpowersensitiveportableapplications.

Type

Name

Freq.

Pins

Exte�nal C�ystal

HXT

400kHz~1�MHz

O�C1/O�C�

Exte�nal RC

ERC

910kHz� �MHz� 4MHz

O�C1

Exte�nal Clock

400kHz~1�MHz

O�C1

Inte�nal High ��eed RC

HIRC

910kHz� �/4/8MHz

—

Inte�nal Low ��eed RC

LIRC

3�kHz

—

Oscillator Types

System Clock Configurations

Therearefivemethodsofgeneratingthesystemclock,fourhighspeedoscillatorsandonelow

speedoscillators.Thehighspeedoscillatorsaretheexternalcrystal/ceramicoscillator,externalRC

networkoscillator,externalclockandtheinternal910kHz,2MHz,4MHzor8MHzRCoscillator.

Theonelowspeedoscillatorsistheinternal32kHzRCoscillator.

HX T

LI RC

Hi gh Sp e ed O sci lla ti on

Lo w S peed O sci lla ti on

f H

f H /6 4

f H /3 2

f H /1 6

f H /8

f H /4

f H /2

6- st age P re sc al er

f L

f SU B

f SYS

HL CL K,

LC KS 2~ LC KS 0 bi ts

ER C

HI RC

Hi gh Sp e ed O sci lla ti on

Co nf i gur at io n Op ti on

Fa st W ak e up fr om S LE EP Mo de or

ID LE M o de Co nt ro l (f or H XT o nl y)

System Clock Configurations

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