STC89C51 is a high gain-replacer with a self-excited oscillation circle which can make it a clock circle.investment Xtal2 ۾ quartz crystal oscillator سان ڳنڍيل آهن ۽ ڪاليٽر ۽ ٻئي جي پڇاڙي ۾، هڪ stable self-excited oscillator ٺاهڻ لاءِ.عام طور ڪٽريل اسcillator جو Output ڪلاڪ frequency of quartz crystal oscillator is 12Mhz, and Capability C1 and C2 are 30pf to fine tune.<br>
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