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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT45F2020 数据表(PDF) 13 Page - Holtek Semiconductor Inc |
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HT45F2020 数据表(HTML) 13 Page - Holtek Semiconductor Inc |
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13 / 85 page  Rev. 1.00 12 April 11, 2017 Rev. 1.00 13 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Fetch Inst. (PC) (System Clock) fSYS Phase Clock T1 Phase Clock T2 Phase Clock T3 Phase Clock T4 Program Counter PC PC+1 PC+2 Pipelining Execute Inst. (PC-1) Fetch Inst. (PC+1) Execute Inst. (PC) Fetch Inst. (PC+2) Execute Inst. (PC+1) System Clocking and Pipelining Forinstructionsinvolvingbranches,suchasjumporcallinstructions,twomachinecyclesare requiredtocompleteinstructionexecution.Anextracycleisrequiredastheprogramtakesone cycletofirstobtaintheactualjumporcalladdressandthenanothercycletoactuallyexecutethe branch.Therequirementforthisextracycleshouldbetakenintoaccountbyprogrammersintiming sensitiveapplications. Fetch Inst. 1 1 MOV A,[12H] 2 CALL DELAY 3 CPL [12H] 4 : 5 : 6 DELAY: NOP Execute Inst. 1 Fetch Inst. 2 Execute Inst. 2 Fetch Inst. 3 Flush Pipeline Fetch Inst. 6 Execute Inst. 6 Fetch Inst. 7 Instruction Fetching Program Counter Duringprogramexecution,theProgramCounterisusedtokeeptrackoftheaddressofthe nextinstructiontobeexecuted.Itisautomaticallyincrementedbyoneeachtimeaninstruction isexecutedexceptforinstructions,suchas“JMP”or“CALL”thatdemandsajumptoanon- consecutiveProgramMemoryaddress.Onlythelower8bits,knownastheProgramCounterLow Register,aredirectlyaddressablebytheapplicationprogram. Whenexecutinginstructionsrequiringjumpstonon-consecutiveaddressessuchasajump instruction,asubroutinecall,interruptorreset,etc.,themicrocontrollermanagesprogramcontrol byloadingtherequiredaddressintotheProgramCounter.Forconditionalskipinstructions,once theconditionhasbeenmet,thenextinstruction,whichhasalreadybeenfetchedduringthepresent instructionexecution,isdiscardedandadummycycletakesitsplacewhilethecorrectinstructionis obtained. Program Counter Program Counter High Byte PCL Register PC9~PC8 PCL7~PCL0 Program Counter |
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