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Cov maub los tau muab faib ua kev sib xyaw ua ke ntawm kev sib xyaw ua ke thiab micro-program controller, ob qho tib si muaj lawv tus kheej qhov zoo thiab qhov tsis zoo.Kev sib xyaw logic maub los yog teeb meem rau kev tsim thiab muaj cov qauv tsim.Thaum tus qauv tsim tiav, nws tsis tuaj yeem hloov kho lossis nthuav dav, tab sis nws nrawm.Tus tsim ntawm microprogram maub los yog yooj yim, cov qauv yooj yim, thiab nws yooj yim los hloov lossis nthuav.Txhawm rau hloov kho cov haujlwm ntawm lub tshuab kev qhia, tsuas yog yuav tsum tau rov ua cov microprogram sib raug;Txawm li cas los, nws ua li ntawd los ntawm executing ib tug shred.Qhov kev sib piv tshwj xeeb yog raws li hauv qab no: Combinatorial logic controllers, tseem hu ua hard-wired controllers, yog tsim los ntawm logic circuits thiab cia siab rau tag nrho cov khoom siv kom paub txog cov haujlwm ntawm cov lus qhia.