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HT48R068B Folha de dados(PDF) 57 Page - Holtek Semiconductor Inc

Nome de Peças HT48R068B
Descrição Electrónicos  Enhanced I/O 8-Bit OTP MCU
Download  118 Pages
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R068B Folha de dados(HTML) 57 Page - Holtek Semiconductor Inc

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Rev. 1.30
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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.


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