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HT68F001 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

Part # HT68F001
Description  Cost-Effective Flash MCU
PDF  55 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT68F001 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc

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Rev. 1.01
38
��to�e� 11� �01�
Rev. 1.01
39
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HT68F001
Cost-Effective Flash MCU
HT68F001
Cost-Effective Flash MCU
Programming Considerations
Bydisablingtherelevantinterruptenablebits,arequestedinterruptcanbepreventedfrombeing
serviced,however,onceaninterruptrequestflagisset,itwillremaininthisconditioninthe
interruptregisteruntilthecorrespondinginterruptisservicedoruntiltherequestflagisclearedby
theapplicationprogram.
Itisrecommendedthatprogramsdonotusethe“CALL”instructionwithintheinterruptservice
subroutine.Interruptsoftenoccurinanunpredictablemannerorneedtobeservicedimmediately.
Ifonlyonestackisleftandtheinterruptisnotwellcontrolled,theoriginalcontrolsequencewillbe
damagedonceaCALLsubroutineisexecutedintheinterruptsubroutine.
EveryinterrupthasthecapabilityofwakingupthemicrocontrollerwhenitisinSLEEPorIDLE
Mode,thewakeupbeinggeneratedwhentheinterruptrequestflagchangesfromlowtohigh.Ifitis
requiredtopreventacertaininterruptfromwakingupthemicrocontrollerthenitsrespectiverequest
flagshouldbefirstsethighbeforeenterSLEEPorIDLEMode.
AsonlytheProgramCounterispushedontothestack,thenwhentheinterruptisserviced,ifthe
contentsoftheaccumulator,statusregisterorotherregistersarealteredbytheinterruptservice
program,theircontentsshouldbesavedtothememoryatthebeginningoftheinterruptservice
routine.
Toreturnfromaninterruptsubroutine,eitheraRETorRETIinstructionmaybeexecuted.TheRETI
instructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysetstheEMI
bithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturntothemain
programleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecutionoffurther
interrupts.
Application Circuits
104
1.8V~5.5V
VSS
VDD
Time Base
PA3/TC
GPI�
HT8 MCU
Co�e
Time�/Event
Counte�
PA0/ICPDA
PA�/ICPCK
PA1
PA4
PA5



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