• 1. System clock frequency: 系统时钟频率

• 1.Clock Tree Synthesis is important in the backend-end design of chip design, and the clock skew has become the major part of constraints that limit system clock frequency.
  时钟树综合是芯片后端设计至关重要的一环，时钟偏差成为限制系统时钟频率的主要因素。
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• 2.Single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.
  固定频率源可以在在通讯系统和雷达系统中作为本机振荡器，也可以作为数字电路的基准时钟信号，因此得到了广泛的应用。
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• 3.And it presents a efficacious method to enhance precision of real time control, which changes value of clock interrupt frequency by changing divided frequency of system tinier.
  同时给出了一种提高实时控制精度的有效方法，即通过改写系统定时器的分频值达到改变定时器时钟中断频率的值。
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