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HT46R002 датащи(PDF) 39 Page - Holtek Semiconductor Inc |
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HT46R002 датащи(HTML) 39 Page - Holtek Semiconductor Inc |
39 / 83 page Rev. 1.21 38 April 11, 2017 Rev. 1.21 39 April 11, 2017 HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU Timer/Event Counter Theprovisionoftimerformanimportantpartofanymicrocontroller,givingthedesignerameansof carryingouttimerelatedfunctions.Thedevicescontainfroman8-bitcount-uptimer.Asthetimer hasthreedifferentoperatingmodes,theycanbeconfiguredtooperateasageneraltimer,anexternal eventcounterorasapulsewidthcapturedevice.Theprovisionofaninternalprescalertotheclock circuitryongivesaddedrangetothetimer. TherearetwotypesofregistersrelatedtotheTimer/EventCounter0.Thefirstistheregisterthat containstheactualvalueofthetimerandintowhichaninitialvaluecanbepreloaded.Reading fromthisregisterretrievesthecontentsoftheTimer/EventCounter0.Thesecondtypeofassociated registeristheTimerControlRegisterwhichdefinesthetimeroptionsanddetermineshowthetimer istobeused.Thedevicecanhavethetimerclockconfiguredtocomefromtheinternalclocksource. Inaddition,thetimerclocksourcecanalsobeconfiguredtocomefromanexternaltimerpin. Configuring the Timer/Event Counter Input Clock Source TheTimer/EventCounterclocksourcecanoriginatefromvarioussources,aninternalclockoran externalpin.Theinternalclocksourceisusedwhenthetimerisinthetimermode.FortheTimer/ EventCounter0,tQIHQIhisinternalclocksourceisfirstdividedbyaprescaler,thedivision ratioofwhichisconditionedbytheTimerControlRegisterbitsT0PSC2~T0PSC0.Theinternal clocksourcecanbederivedfromthesystemclockfSYSorfromtheinstructionclockfSYS/4orthe internallowspeedoscillatorLIRCforTimer/EventCounterselectedbytheclockselectionbits WDTCLS1~WDTCLS0intheWDTCregister. AnexternalclocksourceisusedwhentheTimer/EventCounterisintheeventcountingmode,the clocksourcebeingprovidedonanexternaltimerpinTMR.Dependingupontheconditionofthe T0EGbit,eachhightolow,orlowtohightransitionontheexternaltimerpinwillincrementthe counterbyone. WDT Divider PWM fS 8-to-1 MUX WDT Time-out (28/fS ~ 215/fS) LIRC M U X WDTCLS1, WDTCLS0 fSYS fSYS/4 8-stage Prescaler PWM Circuitry 7 fS/28 8-to-1 MUX T0PSC2~T0PSC0 WS2~WS0 To Timer 0 internal clock Clock Source for Timer/PWM/WDT T0 ON Pr el oad R eg is te r Up C oun te r Da ta B us PF D* 2 ¸ TM R T0 EG M ode C on tr ol Ti me r 0 I nt er nal C lo ck (f T0 CK ) Ov er fl ow to I nt er ru pt T0 M1 , T0 M0 T0 OV Note:“*”meansforHT46R003only. 8-bit Timer/Event Counter 0 Structure |
Аналогичный номер детали - HT46R002 |
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Аналогичное описание - HT46R002 |
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