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HT46R002 датащи(PDF) 44 Page - Holtek Semiconductor Inc |
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HT46R002 датащи(HTML) 44 Page - Holtek Semiconductor Inc |
44 / 83 page Rev. 1.21 44 April 11, 2017 Rev. 1.21 45 April 11, 2017 HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU +1 +2 +3 +4 Ti me r Ex te rn al T MR Pi n I npu t T0 ON - w it h T0 EG =0 In te r nal C lo ck o r Pr e sca le r Ou t put In cr em en t Ti me r C oun te r Pr e sca le r Ou t p ut i s sa m p le d at e ve r y fa lli n g e d g e of T 1. Pulse Width Capture Mode Timing Chart (T0EG=0) Prescaler BitsT0PSC2~T0PSC0oftheTMR0Cregistercanbeusedtodefineadivisionratiofortheinternal clocksourceoftheTimer/EventCounterenablinglongertimeoutperiodstobeset. PFD Function (for HT46R003) TheProgrammableFrequencyDividerprovidesameansofproducingavariablefrequencyoutput suitableforapplication,suchassomeinterfacesrequiringaprecisefrequencygenerator. TheTimer/EventCounteroverflowsignalistheclocksourceforthePFDfunction,whichis controlledbyPFDCbitinCTRL0.ForthisdevicetheclocksourcecancomefromTimer/Event Counter0.Theoutputfrequencyiscontrolledbyloadingtherequiredvaluesintothetimerprescaler andtimerregisterstogivetherequireddivisionratio.Thecounterwillbegintocount-upfromthis preloadregistervalueuntilfull,atwhichpointanoverflowsignalisgenerated,causingboththePFD outputstochangestate.Thenthecounterwillbeautomaticallyreloadedwiththepreloadregister valueandcontinuecounting-up.IftheCTRL0registerhasselectedthePFDfunction,thenforPFD outputtooperate,itisessentialforthePortAcontrolregisterPACtosetthePFDpinsasoutputs. PA6mustbesethightoactivatethePFD.Theoutputdatabitscanbeusedastheon/offcontrolbit forthePFDoutputs.NotethatthePFDoutputswillallbelowiftheoutputdatabitisclearedto zero. Ti me r Ov er fl ow PF D Cl oc k PA 6 Da ta PF D Ou t put a t PA 6 PFD Function I/O Interfacing TheTimer/EventCounter,whenconfiguredtorunintheeventcounterorpulsewidthcapture mode,requirestheuseofanexternaltimerpinforitsoperation.Asthispinisasharedpinitmust beconfiguredcorrectlytoensurethatitissetforuseasaTimer/EventCounterinputpin.Thisis achievedbyensuringthatthemodeselectsbitsintheTimer/EventCountercontrolregister,either theeventcounterorpulsewidthcapturemode.AdditionallythecorrespondingPortControlRegister bitmustbesethightoensurethatthepinissetasaninput.Anypull-highresistorconnectedtothis pinwillremainvalidevenifthepinisusedasaTimer/EventCounterinput. |
Аналогичный номер детали - HT46R002 |
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Аналогичное описание - HT46R002 |
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