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飞思卡尔单片机锁相环程序，详细说明了锁相环的配置步骤以及计算方法(Freescale MCU PLL procedures, a detailed description of the PLL configuration steps and calculation methods)

cj60lib示例代码，包含例子的工程，虽然简单却实用。(example of cj60lib)

说明：  它是关于80C51单片机的原理介绍和使用其开发的过程，有具体的实例。(It was introduced on the 80C51 microcontroller and use the principle of its development process, with specific examples.)

开关记忆和18B20在12864显视和读写24C20(Switch Memory and 18B20 were in the TV and read 24C20 12864)

状态机按键检测，实现单击双击多击功能,单片机用的是STM8L(Key detection state machine to achieve multi-click-click, double-click function)

基于51单片机实现定位，并通过sim900a把定位信息发送到指定手机(base on 51 chip,send location to phone)

at89c52的示例程序，简单的介绍了led的是使用(At89c52 example program, little led is used)

说明：  下面的程序利用友元函数求两点间的距离。请你将有关的程序补充完整，并总结为什么这里要用友元函数来求两点间的距离。(using friend to get the result.)

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新编MCS-51单片机应用 完本。 希望对大家有用(New MCS-51 microcontroller applications complete this. I hope useful)