HT45F65 datasheet(131/231 Pages) HOLTEK

131 / 231 page

Rev. 1.60

130

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Rev. 1.60

131

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

PWM Output Mode

Toselectthismode,bitsT1AM1,T1AM0andT1BM1,T1BM0intheTM1C1andTM1C2register

shouldbesetto10respectivelyandalsothecorrespondingT1AIO1,T1AIO0andT1BIO1,T1BIO0

bitsshouldbesetto10respectively.ThePWMfunctionwithintheTMisusefulforapplications

whichrequirefunctionssuchasmotorcontrol,heatingcontrol,illuminationcontroletc.By

providingasignaloffixedfrequencybutofvaryingdutycycleontheTMoutputpin,asquarewave

ACwaveformcanbegeneratedwithvaryingequivalentDCRMSvalues.

AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated

waveformisextremelyflexible.InthePWMmode,theT1CCLRbithasnoeffectasthePWM

period.BothoftheCCRAandCCRPregistersareusedtogeneratethePWMwaveform,oneregister

isusedtocleartheinternalcounterandthuscontrolthePWMwaveformfrequency,whiletheother

oneisusedtocontrolthedutycycle.Whichregisterisusedtocontroleitherfrequencyordutycycle

isdeterminedusingtheT1DPXbitintheTM1C1register.ThePWMwaveformfrequencyandduty

cyclecanthereforebecontrolledbythevaluesintheCCRAandCCRPregisters.

Aninterruptflag,oneforeachoftheCCRAandCCRP,willbegeneratedwhenacomparematch

occursfromeitherComparatorAorComparatorP.TheT1OCbitintheTM1C1registerisusedto

selecttherequiredpolarityofthePWMwaveformwhilethetwoT1IO1andT1IO0bitsareusedto

enablethePWMoutputortoforcetheTMoutputpintoafixedhighorlowlevel.TheT1POLbitis

usedtoreversethepolarityofthePWMoutputwaveform.

• ETM, PWM Mode, Edge - aligned Mode, T1CCLR=0

CCRP

001b

010b

011b

100b

101b

110b

111b

000b

Pe�iod

1�8

��6

38�

�1�

6�0

768

896

10��

A Duty

CCRA

B Duty

CCRB

IffSYS=16MHz,TMclocksourceselectfSYS/4,CCRP=100b,CCRA=128andCCRB=256,

TheTP1APWMoutputfrequency=(fSYS/4)/512=fSYS/2048=7.8125kHz,duty=128/512=25%.

TheTP1B_nPWMoutputfrequency=(fSYS/4)/512=fSYS/2048=7.8125kHz,duty=256/512=50%.

IftheDutyvaluedefinedbyCCRAorCCRBregisterisequaltoorgreaterthanthePeriodvalue,

thenthePWMoutputdutyis100%.

• ETM, PWM Mode, Edge - aligned Mode, T1CCLR=1

CCRP

511

512

1021

1022

1023

Pe�iod

�

�11

�1�

10�1

10��

10�3

B Duty

CCRB

• ETM, PWM Mode, Center - aligned Mode, T1CCLR=0

CCRP

001b

010b

011b

100b

101b

110b

111b

000b

Pe�iod

��6

38�

�1�

6�0

768

896

10��

�0�6

A Duty

(CCRA×�)-1

B Duty

(CCRB×�)-1

• ETM, PWM Mode, Center - aligned Mode, T1CCLR=1

CCRP

511

512

1021

1022

1023

Pe�iod

�

�11

�1�

10�1

10��

10�3

�0�6

B Duty

(CCRB×�)-1

HT45F65 Datasheet(PDF) 131 Page - Holtek Semiconductor Inc

HT45F65 Datasheet(HTML) 131 Page - Holtek Semiconductor Inc

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