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HT45R4U датащи(PDF) 40 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 40 Page - Holtek Semiconductor Inc |
40 / 105 page Rev. 1.10 40 �a��� 1�� �01� Rev. 1.10 41 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Timer/Event Counters Theprovisionoftimersformanimportantpartofanymicrocontroller,givingthedesignerameans ofcarryingouttimerelatedfunctions.Thedevicecontainsthree8-bitcount-uptimers.Aseach timerhasthreedifferentoperatingmodes,theycanbeconfiguredtooperateasageneraltimer,an externaleventcounterorasapulsewidthmeasurementdevice.Theprovisionofaprescalertothe clockcircuitryofthe8-bitTimer/EventCounteralsogivesaddedrangetothistimer. TherearetwotypesofregistersrelatedtotheTimer/EventCounters.Thefirstaretheregisters thatcontaintheactualvalueoftheTimer/EventCounterandintowhichaninitialvaluecanbe preloaded.ReadingfromtheseregistersretrievesthecontentsoftheTimer/EventCounter.The secondtypeofassociatedregisteristheTimerControlRegisterwhichdefinesthetimeroptionsand determineshowtheTimer/EventCounteristobeused.TheTimer/EventCounterscanhavethetheir clockconfiguredtocomefromaninternalclocksource.Inaddition,theirclocksourcecanalsobe configuredtocomefromanexternaltimerpin. Configuring the Timer/Event Counter Input Clock Source Theinternaltimerclockcanoriginatefromvarioussources.Thesystemclocksourceisusedwhen theTimer/EventCounterisinthetimermodeorinthepulsewidthmeasurementmode.Thisinternal clocksourceisfSYSwhichisalsodividedbyaprescaler,thedivisionratioofwhichisconditioned bytheTimerControlRegister,TMRnC,bitsTnPSC0~TnPSC2. Anexternalclocksourceisusedwhenthetimerisintheeventcountingmode,theclocksource beingprovidedonanexternaltimerpinTMR0,TMR1orTMR2dependinguponwhichtimeris used.DependingupontheconditionoftheTnEGbit,eachhightolow,orlowtohightransitionon theexternaltimerpinwillincrementthecounterbyone. 7- st a ge Pr es ca le r f PS C0 ~f PS C7 (f SY S /1 ~f SY S / 128) f SY S 8 Timer/Event Counters Shared Prescaler T MR n Ti me r/ Ev ent C oun te r M ode C on tr ol Tn ON Pr el oad R eg is te r Ti me r/ Ev ent Co un te r Da ta B us Re l oad Ov er fl ow to In te rr up t 2 MU X Tn PS C2 ~T n PSC 0 (1 /1 ~1 /1 28 ) 8- bi t Ti me r/ Ev en t C ount er Tn M1 Tn M0 f PS C0 ~f PS C7 (f SY S /1 ~f SY S / 128) PF D ¸ Tn EG Fi lt er Fi lt er O n/ Of f Co nf ig ur at io n op ti on 8 (D er iv ed fr om Ti me r 0 onl y) 8-bit Timer/Event Counter Structure (n=0, 1, 2) |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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