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HT45F2020 Datasheet(PDF) 46 Page - Holtek Semiconductor Inc |
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HT45F2020 Datasheet(HTML) 46 Page - Holtek Semiconductor Inc |
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46 / 85 page  Rev. 1.00 46 April 11, 2017 Rev. 1.00 47 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Periodic Type TM Register Description OveralloperationofthePeriodicTMiscontrolledusingaseriesofregisters.Areadonlyregister pairexiststostoretheinternalcounter10-bitvalue,whiletworead/writeregisterpairsexisttostore theinternal10-bitCCRAandCCRPvalue.Theremainingtworegistersarecontrolregisterswhich setupthedifferentoperatingandcontrolmodes. Register Name Bit 7 6 5 4 3 2 1 0 PTMC0 PTPAU PTCK2 PTCK1 PTCK0 PTON — — — PTMC1 PTM1 PTM0 PTIO1 PTIO0 PTOC PTPOL PTCAPTS PTCCLR PTMDL D7 D6 D5 D4 D3 D2 D1 D0 PTMDH — — — — — — D9 D8 PTMAL D7 D6 D5 D4 D3 D2 D1 D0 PTMAH — — — — — — D9 D8 PTMRPL PTRP7 PTRP6 PTRP5 PTRP4 PTRP3 PTRP2 PTRP1 PTRP0 PTMRPH — — — — — — PTRP9 PTRP8 Periodic TM Registers List PTMC0 Register Bit 7 6 5 4 3 2 1 0 Name PTPAU PTCK2 PTCK1 PTCK0 PTON — — — R/W R/W R/W R/W R/W R/W — — — POR 0 0 0 0 0 — — — Bit7 PTPAU:PTMCounterPausecontrol 0:Run 1:Pause Thecountercanbepausedbysettingthisbithigh.Clearingthebittozerorestores normalcounteroperation.WheninaPauseconditionthePTMwillremainpowered upandcontinuetoconsumepower.Thecounterwillretainitsresidualvaluewhen thisbitchangesfromlowtohighandresumecountingfromthisvaluewhenthebit changestoalowvalueagain. Bit6~4 PTCK2~PTCK0:SelectPTMCounterclock 000:fSYS/4 001:fSYS 010:fH/16 011:fH/64 100:fSUB 101:fSUB 110:PTCKrisingedgeclock 111:PTCKfallingedgeclock ThesethreebitsareusedtoselecttheclocksourceforthePTM.Theexternalpinclock sourcecanbechosentobeactiveontherisingorfallingedge.TheclocksourcefSYSis thesystemclock,whilefHandfSUBareotherinternalclocks,thedetailsofwhichcan befoundintheoscillatorsection. |
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