The article to at89C51 monolithic integrated circuit chip, the crystal oscillator, various primary devices which as well as the pressed key control model involved has made the detailed introduction.
文章对AT 89 C 51单片机芯片，晶体振荡器，涉及到的各元器件以及按键控制模型做了详细的介绍。
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Still further, a controller may be coupled to receive a control signalcorresponding to a variable impedance level, and control a local oscillator coupled to the mixer responsive to the control signal.
This paper introduces a method to realize frequency control of a noncoherent frequency-agility adaptive radar by using frequency setting and waiting, digital local oscillator and micro-processor.