HT45F75 datasheet(154/190 Pages) HOLTEK

154 / 190 page

Rev. 1.10

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Serial Interface Module Interrupt

TheSerialInterfaceModuleInterrupt,alsoknownastheSIMinterrupt,iscontainedwithinthe

Multi-functionInterrupt.AnSIMInterruptrequestwilltakeplacewhentheSIMInterruptrequest

flag,SIF,isset,whichoccurswhenabyteofdatahasbeenreceivedortransmittedbytheSIM

interface.Toallowtheprogramtobranchtoitsrespectiveinterruptvectoraddress,theglobal

interruptenablebit,EMI,andtheSerialInterfaceInterruptenablebit,SIE,andMuti-function

interruptenablebits,mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandabyte

ofdatahasbeentransmittedorreceivedbytheSIMinterface,asubroutinecalltotherespective

Multi-functionInterruptvector,willtakeplace.WhentheSerialInterfaceInterruptisserviced,the

EMIbitwillbeautomaticallyclearedtodisableotherinterrupts,howeveronlytheMulti-function

interruptrequestflagwillbealsoautomaticallycleared.AstheSIFflagwillnotbeautomatically

cleared,ithastobeclearedbytheapplicationprogram.

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.

LX T

LI RC

f SY S /4

¸ 2 ~ 2

81 5

¸ 2 ~ 2

TB 11 ~T B1 0

Ti me B as e 0 In te rr upt

Ti me B as e 1 In te rr upt

Co nf ig ur at io n

Op ti o n

TB CK B it

TB 02 ~T B0 0

f TB

f SU B

Time Base Interrupt

HT45F75 Datasheet(PDF) 154 Page - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 154 Page - Holtek Semiconductor Inc

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