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HT67F488 Datasheet(PDF) 68 Page - Holtek Semiconductor Inc |
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HT67F488 Datasheet(HTML) 68 Page - Holtek Semiconductor Inc |
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68 / 171 page  Rev. 1.60 68 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM TMnC0 Register Bit 7 6 5 4 3 2 1 0 �a�e TnPAU TnCK� TnCK1 TnCK0 TnO� — — — R/W R/W R/W R/W R/W R/W — — — POR 0 0 0 0 0 — — — Bit7 TnPAU:TMnCounterPauseControl 0:Run 1:Pause Thecountercanbepausedbysettingthisbithigh.Clearingthebittozerorestores normalcounteroperation.WheninaPauseconditiontheTMwillremainpoweredup andcontinuetoconsumepower.Thecounterwillretainitsresidualvaluewhenthisbit changesfromlowtohighandresumecountingfromthisvaluewhenthebitchanges toalowvalueagain. Bit6~4 TnCK2~TnCK0:SelectTMnCounterclock 000:fSYS/4 001:fH 010:fH/16 011:fH/64 100:fTBC 101:fTBC 110:TCKnrisingedgeclock 111:TCKnfallingedgeclock ThesethreebitsareusedtoselecttheclocksourcefortheTM.Theexternalpinclock sourcecanbechosentobeactiveontherisingorfallingedge.TheclocksourcefSYSis thesystemclock,whilefHandfTBCareotherinternalclocks,thedetailsofwhichcan befoundintheoscillatorsection. Bit3 TnON:TMnCounterOn/OffControl 0:Off 1:On Thisbitcontrolstheoverallon/offfunctionoftheTM.Settingthebithighenablesthe countertorun,clearingthebitdisablestheTM.Clearingthisbittozerowillstopthe counterfromcountingandturnofftheTMwhichwillreduceitspowerconsumption. Whenthebitchangesstatefromlowtohightheinternalcountervaluewillberesetto zero,howeverwhenthebitchangesfromhightolow,theinternalcounterwillretain itsresidualvalueuntilthebitreturnshighagain. IftheTMisintheCompareMatchOutputModethentheTMoutputpinwillbereset toitsinitialcondition,asspecifiedbytheTMOutputcontrolbit,whenthebitchanges fromlowtohigh. Bit2~0 Unimplemented,readas“0” |
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