简要介绍了实时时钟isl 1208的原理、特点、功能及应用，并给出了与单片机的硬件连接图及控制程序。
This article introduce the principle, the character, the function and the application of real time clock ISL1208 and then gives the hardware and software design.
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。
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.
介绍了高精度实时时钟芯片rtc 4553的功能、特点、原理及应用，并给出了电路原理图和控制程序。
The paper introduces the function, the feature, the principle and the application of hige accuracy real time clock chip RTC4553, it gives hardware and software design.
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