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HT48R068B データシート(PDF) 69 Page - Holtek Semiconductor Inc

部品番号 HT48R068B
部品情報  Enhanced I/O 8-Bit OTP MCU
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R068B データシート(HTML) 69 Page - Holtek Semiconductor Inc

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Rev. 1.30
68
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HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
External Interrupt
Foranexternalinterrupttooccur,theglobalinterruptenablebit,EMI,andexternalinterruptenable
bit,INTE,mustfirstbeset.Anactualexternalinterruptwilltakeplacewhentheexternalinterrupt
requestflag,INTF,isset,asituationthatwilloccurwhenanedgetransitionappearsontheexternal
INTline.Thetypeoftransitionthatwilltriggeranexternalinterrupt,whetherhightolow,lowto
highorbothisdeterminedbytheINTEG0andINTEG1bits,whicharebits6and7respectively,in
theCTRL1controlregister.Thesetwobitscanalsodisabletheexternalinterruptfunction.
INTEG1
INTEG0
Edge Trigger Type
0
0
Exte�nal inte���pt disa�le
0
1
Rising edge T�igge�
1
0
�alling edge T�igge�
1
1
Both edge T�igge�
Theexternalinterruptpinispin-sharedwiththeI/OpinPA3andcanonlybeconfiguredasan
externalinterruptpinifthecorrespondingexternalinterruptenablebitintheINTC0registerhas
beensetandtheedgetriggertypehasbeenselectedusingtheCTRL1register.Thepinmustalso
besetupasaninputbysettingthecorrespondingPAC.3bitintheportcontrolregister.Whenthe
interruptisenabled,thestackisnotfullandanactivetransitionappearsontheexternalinterruptpin,
asubroutinecalltotheexternalinterruptvectoratlocation04H,willtakeplace.Whentheinterrupt
isserviced,theexternalinterruptrequestflag,EIF,willbeautomaticallyresetandtheEMIbitwill
beautomaticallyclearedtodisableotherinterrupts.Notethatanypull-highresistorconnectionson
thispinwillremainvalidevenifthepinisusedasanexternalinterruptinput.
Timer/Event Counter Interrupt
ForaTimer/EventCounterinterrupttooccur,theglobalinterruptenablebit,EMI,andthe
correspondingtimerinterruptenablebit,TnE,mustfirstbeset.AnactualTimer/EventCounter
interruptwilltakeplacewhentheTimer/EventCounterrequestflag,TnF,isset,asituationthatwill
occurwhentherelevantTimer/EventCounteroverflows.Whentheinterruptisenabled,thestackis
notfullandaTimer/EventCounternoverflowoccurs,asubroutinecalltotherelevanttimerinterrupt
vector,willtakeplace.Whentheinterruptisserviced,thetimerinterruptrequestflag,TnF,willbe
automaticallyresetandtheEMIbitwillbeautomaticallyclearedtodisableotherinterrupts.
Multi-function Interrupt
Unliketheotherindependentinterrupts,theMulti-functionInterrupthasnoindependentsource,but
ratherisformedfromotherexistinginterruptsources,namelytheTime-baseInterrupt,SIMInterrupt
andSPIAInterrupt.AMulti-functionInterruptrequestwilltakeplacewhentheMulti-function
Interruptrequestflag,MFFisset.TheMulti-functionInterruptflagwillbesetwhenanyoftheir
includedfunctionsgenerateaninterruptrequestflag.Toallowtheprogramtobranchtoitsrespective
interruptvectoraddress,whentheMulti-functionInterruptisenabledandthestackisnotfull,and
eitheroneoftheinterruptscontainedwithineachofMulti-functionInterruptoccurs,asubroutine
calltotheMulti-functionInterruptvectorwilltakeplace.Whentheinterruptisserviced,theMulti-
FunctionInterruptrequestflagwillbeautomaticallyresetandtheEMIbitwillbeautomatically
clearedtodisableotherinterrupts.However,itmustbenotedthat,althoughtheMulti-function
Interruptflagwillbeautomaticallyresetwhentheinterruptisserviced,therequestflagsfromthe
originalsourceoftheMulti-functionInterrupt,namelytheTime-baseInterrupt,SIMInterrupt
andSPIAInterruptwillnotbeautomaticallyresetandmustbemanuallyresetbytheapplication
program.AfteraMulti-functionhasbeengenerated,theapplicationprogramcandeterminewhich
interruptsourcehasoccurredbyinterrogatingtheinterruptrequestflags,SIF,SIMForTBFwithin
theMFICregister.


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