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HT46R002 Scheda tecnica(PDF) 48 Page - Holtek Semiconductor Inc |
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HT46R002 Scheda tecnica(HTML) 48 Page - Holtek Semiconductor Inc |
48 / 83 page Rev. 1.21 48 April 11, 2017 Rev. 1.21 49 April 11, 2017 HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU HT46R002/HT46R003 Cost-Effective A/D 8-Bit OTP MCU f SY S /2 PW M [P WM ] =1 00 [P WM ] =1 01 PW M [P WM ] =1 02 PW M [P WM ] =1 03 PW M PW M cycl e : 256/ f SY S 25/ 64 26/ 64 26/ 64 26/ 64 25/ 64 25/ 64 25/ 64 25/ 64 25/ 64 25/ 64 25/ 64 26/ 64 26/ 64 25/ 64 25/ 64 26/ 64 25/ 64 26/ 64 26/ 64 26/ 64 M odul at i on cycl e 0 PW M m odul at i on per i od : 64/ f SY S M odul at i on cycl e 1 M odul at i on cycl e 2 M odul at i on cycl e 3 M odul at i on cycl e 0 6+2 PWM Mode PW M Re gi st er ( 6+ 2) M od e b7 b0 AC va lu e DC va lu e PWM Register for 6+2 Mode 7+1 PWM Mode EachfullPWMcycle,asitiscontrolledbyan8-bitPWMregister,has256clockperiods.However, inthe7+1PWMmode,eachPWMcycleissubdividedintotwoindividualsub-cyclesknownas modulationcycle0~modulationcycle1,denotedasiinthetable.Eachoneofthesetwosub-cycles contains128clockcycles.Inthismode,amodulationfrequencyincreaseoftwoisachieved.The8-bit PWMregistervalue,whichrepresentstheoveralldutycycleofthePWMwaveform,isdividedinto twogroups.Thefirstgroupwhichconsistsofbit1~bit7isdenotedhereastheDCvalue.Thesecond groupwhichconsistsofbit0isknownastheACvalue.Inthe7+1PWMmode,thedutycyclevalue ofeachofthetwomodulationsub-cyclesisshowninthefollowingtable. Parameter AC(0~1) DC (Duty Cycle) Modulation cycle i (i=0~1) i<AC (DC+1)/128 i>=AC DC/128 Thefollowingdiagramillustratesthewaveformsassociatedwiththe7+1modePWMoperation.It isimportanttonotehowthesinglePWMcycleissubdividedinto2individualmodulationcycles, numbered0and1andhowtheACvalueisrelatedtothePWMvalue. |
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