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HT45F65 Datasheet(PDF) 183 Page - Holtek Semiconductor Inc |
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HT45F65 Datasheet(HTML) 183 Page - Holtek Semiconductor Inc |
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183 / 231 page  Rev. 1.60 18� �ove��e� ��� �01� Rev. 1.60 183 �ove��e� ��� �01� HT45F65/HT45F66/HT45F67 Glucose Meter 8-Bit Flash MCU Time Base Interrupts ThefunctionoftheTimeBaseInterruptsistoprovideregulartimesignalintheformofaninternal interrupt.Theyarecontrolledbytheoverflowsignalsfromtheirrespectivetimerfunctions.When thesehappenstheirrespectiveinterruptrequestflags,TB0ForTB1Fwillbeset.Toallowthe programtobranchtotheirrespectiveinterruptvectoraddresses,theglobalinterruptenablebit,EMI andTimeBaseenablebits,TB0EorTB1E,mustfirstbeset.Whentheinterruptisenabled,thestack isnotfullandtheTimeBaseoverflows,asubroutinecalltotheirrespectivevectorlocationswill takeplace.Whentheinterruptisserviced,therespectiveinterruptrequestflag,TB0ForTB1F,will beautomaticallyresetandtheEMIbitwillbeclearedtodisableotherinterrupts. ThepurposeoftheTimeBaseInterruptistoprovideaninterruptsignalatfixedtimeperiods.Their clocksourcesoriginatefromtheinternalclocksourcefTB.ThisfTBinputclockpassesthrougha divider,thedivisionratioofwhichisselectedbyprogrammingtheappropriatebitsintheTBC registertoobtainlongerinterruptperiodswhosevalueranges.TheclocksourcethatgeneratesfTB, whichinturncontrolstheTimeBaseinterruptperiod,canoriginatefromseveraldifferentsources, asshownintheSystemOperatingModesection. M U X LX T f SY S /4 ¸ 2 ~ 2 81 5 ¸ 2 ~ 2 12 15 TB 11~ TB 10 Ti me B as e 0 In te rr upt Ti me B as e 1 In te rr upt TB CK B it TB 02~ TB 00 f TB f TB C M U X Co nf i gur at io n Op ti o n LI RC Time Base Interrupt TBC Register Bit 7 6 5 4 3 2 1 0 �a�e TBO� TBCK TB11 TB10 LXTLP TB0� TB01 TB00 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 1 1 0 1 1 1 Bit7 TBON:TB0andTB1Control 0:Disable 1:Enable Bit6 TBCK:SelectfTBClock 0:fTBC 1:fSYS/4 Bit5~4 TB11~TB10:SelectTimeBase1Time-outPeriod 00:4096/fTB 01:8192/fTB 10:16384/fTB 11:32768/fTB Bit3 LXTLP:LXTLowPowerControl 0:Disable(LXTquickstart-up) 1:Enable(LXTslowstart-up) Bit2~0 TB02~TB00:SelectTimeBase1Time-outPeriod 000:256/fTB 001:512/fTB 010:1024/fTB 011:2048/fTB 100:4096/fTB 101:8192/fTB 110:16384/fTB 111:32768/fTB |
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