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HT66F20 Datasheet(PDF) 101 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 101 Page - Holtek Semiconductor Inc |
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101 / 298 page  Rev. 1.90 100 �e���a�� 18� �01� Rev. 1.90 101 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM EachdeviceintheseriescontainsaspecificnumberofeitherCompactType,StandardTypeand EnhancedTypeTMunitswhichareshowninthetabletogetherwiththeirindividualreferencename, TM0~TM3. Device TM0 TM1 TM2 TM3 HT66��0 10-�it CTM 10-�it STM — — HT66��0 10-�it CTM 10-�it ETM — — HT66�40 10-�it CTM 10-�it ETM 16-�it STM — HT66�50 10-�it CTM 10-�it ETM 16-�it STM 10-�it CTM HT66�60 10-�it CTM 10-�it ETM 16-�it STM 10-�it CTM TM Name/Type Reference TM Operation ThethreedifferenttypesofTMofferadiverserangeoffunctions,fromsimpletimingoperations toPWMsignalgeneration.ThekeytounderstandinghowtheTMoperatesistoseeitintermsof afreerunningcounterwhosevalueisthencomparedwiththevalueofpre-programmedinternal comparators.Whenthefreerunningcounterhasthesamevalueasthepre-programmedcomparator, knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhichcanclearthe counterandperhapsalsochangetheconditionoftheTMoutputpin.TheinternalTMcounteris drivenbyauserselectableclocksource,whichcanbeaninternalclockoranexternalpin. TM Clock Source TheclocksourcewhichdrivesthemaincounterineachTMcanoriginatefromvarioussources. TheselectionoftherequiredclocksourceisimplementedusingtheTnCK2~TnCK0bitsintheTM controlregisters.TheclocksourcecanbearatioofeitherthesystemclockfSYSortheinternalhigh clockfH,thefTBCclocksourceortheexternalTCKnpin.Notethatsettingthesebitstothevalue101 willselectareservedclockinput,ineffectdisconnectingtheTMclocksource.TheTCKnpinclock sourceisusedtoallowanexternalsignaltodrivetheTMasanexternalclocksourceorforevent counting. TM Interrupts TheCompactandStandardtypeTMseachhavetwointernalinterrupts,oneforeachoftheinternal comparatorAorcomparatorP,whichgenerateaTMinterruptwhenacomparematchcondition occurs.AstheEnhancedtypeTMhasthreeinternalcomparatorsandcomparatorAorcomparator BorcomparatorPcomparematchfunctions,itconsequentlyhasthreeinternalinterrupts.Whena TMinterruptisgenerateditcanbeusedtoclearthecounterandalsotochangethestateoftheTM outputpin. |
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