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HT48R068B Folha de dados(PDF) 57 Page - Holtek Semiconductor Inc |
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HT48R068B Folha de dados(HTML) 57 Page - Holtek Semiconductor Inc |
57 / 118 page Rev. 1.30 �6 �e���a�� 0�� �01� Rev. 1.30 �7 �e���a�� 0�� �01� HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU Mode,thesecondistoensurethattheportcontrolregisterconfiguresthepinasaninput.Itshould benotedthatintheeventcountingmode,eveniftheisintheIdle/SleepMode,theTimer/Event CounterwillcontinuetorecordexternallychanginglogiceventsonthetimerinputTCnpin.Asa resultwhenthetimeroverflowsitwillgenerateatimerinterruptandcorrespondingwake-upsource. In cr em en t Ti me r Co nt ro ll er Pr e sca le r Ou t put Ti me r + 1 Ti me r + 2 Ti me r + NT im er + N + 1 Timer Mode Timing Chart Ti me r+ 2 Ex te rn al E ve nt In cr em en t Ti me r Co unt er Ti me r+ 3 Ti me r+ 1 Event Counter Mode Timing Chart (TnEG=1) Pulse Width Capture Mode Inthismode,theTimer/EventCountercanbeutilisedtomeasurethewidthofexternalpulses appliedtotheexternaltimerpin.Tooperateinthismode,theOperatingModeSelectbitpair,TnM1/ TnM0,intheTimerControlRegistermustbesettothecorrectvalueasshown. Cont�ol Registe� Ope�ating Mode Bit7 Bit6 Select Bits fo� the P�lse Width Capt��e Mode 1 1 Inthismodetheinternalclock,fSYS,fSYS/4ortheLXT,isusedastheinternalclockforthe8-bit Timer/EventCounter.However,theclocksource,fSYS,forthe8-bittimerisfurtherdividedbya prescaler,thevalueofwhichisdeterminedbythePrescalerRateSelectbitsTnPSC2~TnPSC0, whicharebits2~0intheTimerControlRegister.AftertheotherbitsintheTimerControlRegister havebeensetup,theenablebitTnON,whichisbit4oftheTimerControlRegister,canbesethigh toenabletheTimer/EventCounter,howeveritwillnotactuallystartcountinguntilanactiveedgeis receivedontheexternaltimerpin. IftheActiveEdgeSelectbitTnEG,whichisbit3oftheTimerControlRegister,islow,onceahigh tolowtransitionhasbeenreceivedontheexternaltimerpin,theTimer/EventCounterwillstart countinguntiltheexternaltimerpinreturnstoitsoriginalhighlevel.Atthispointtheenablebitwill beautomaticallyresettozeroandtheTimer/EventCounterwillstopcounting.IftheActiveEdge Selectbitishigh,theTimer/EventCounterwillbegincountingoncealowtohightransitionhas beenreceivedontheexternaltimerpinandstopcountingwhentheexternaltimerpinreturnstoits originallowlevel.Asbefore,theenablebitwillbeautomaticallyresettozeroandtheTimer/Event Counterwillstopcounting.ItisimportanttonotethatinthepulsewidthcaptureMode,theenable bitisautomaticallyresettozerowhentheexternalcontrolsignalontheexternaltimerpinreturns toitsoriginallevel,whereasintheothertwomodestheenablebitcanonlyberesettozerounder programcontrol. |
Nº de peça semelhante - HT48R068B_15 |
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Descrição semelhante - HT48R068B_15 |
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