HT45F56 datasheet(71/90 Pages) HOLTEK

71 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

Debounce Interrupt

TheDebounceInterruptiscontrolledbytheDebouncecircuitoutputtransition.ADebounce

InterruptrequestwilltakeplacewhentheDebounceInterruptrequestflag,DEBF,isset,which

occurswhentheDebouncecircuitoutputchangesstate.Toallowtheprogramtobranchtoits

respectiveinterruptvectoraddress,theglobalinterruptenablebit,EMI,andComparatorInterrupt

enablebit,DEBE,mustfirstbeset.Whentheinterruptisenabled,thestackisnotfullandthe

Debouncecircuitoutputtransitionoccurs,asubroutinecalltotheDebounceInterruptvectorwill

takeplace.Whentheinterruptisserviced,theDebounceInterruptflag,DEBF,willbeautomatically

cleared.TheEMIbitwillalsobeautomaticallyclearedtodisableotherinterrupts.

Time Base Interrupt

ThefunctionoftheTimeBaseInterruptistoprovideregulartimesignalintheformofaninternal

interrupt.Itiscontrolledbytheoverflowsignalfromitsinternaltimer.Whenthishappensits

interruptrequestflag,TBnF,willbeset.Toallowtheprogramtobranchtoitsrespectiveinterrupt

vectoraddresses,theglobalinterruptenablebit,EMIandTimeBaseenablebit,TBnE,mustfirstbe

set.Whentheinterruptisenabled,thestackisnotfullandtheTimeBaseoverflows,asubroutinecall

toitsrespectivevectorlocationwilltakeplace.Whentheinterruptisserviced,theinterruptrequest

flag,TBnF,willbeautomaticallyresetandtheEMIbitwillbeclearedtodisableotherinterrupts.

ThepurposeoftheTimeBaseInterruptistoprovideaninterruptsignalatfixedtimeperiods.Its

clocksource,fTB,originatesfromtheinternalclocksourcefSYS/4orfTBCandthenpassesthrough

adivider,thedivisionratioofwhichisselectedbyprogrammingtheappropriatebitsintheTBC

registertoobtainlongerinterruptperiodswhosevalueranges.Theclocksourcewhichinturn

controlstheTimeBaseinterruptperiodisselectedusingtheTBCKbitintheTBCregister.

fSYS/4

fTBC

1/28~1/215

TBCK

fTB

TB0[2:0]

TB1[1:0]

Time Base 0 Interrupt

Time Base 1 Interrupt

1/212~1/215

Time Base Interrupts

HT45F56 Datasheet(PDF) 71 Page - Holtek Semiconductor Inc