硬件电路设计主要包括中央处理单元电路、时钟电路、软件用汇编语言来实现，主要包括主程序、时光设置子程序等软件模块。
Hardware circuit design includes a central processing unit circuit, clock circuit, assembly language software to achieve, including the main program, subroutine, such as set-up time software modules.
锁相环在微处理器领域中的一个重要应用就是为系统提供片内时钟，它是微处理器时钟电路中的核心模块。
One important application of PLL in microprocessor is to provide on-chip clock for the system. It has been a core module of microprocessor.
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