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.
本文介绍了实时时钟芯片RX-8025的功能及特点，并结合在9S12A64单片机上的应用，给出了具体的程序清单。
This paper introduces the functions and characteristic of RX-8025. Combining the 9S12A64 to the RX-8025 , applied in a specific way, and given concrete procedure list.
在区域火灾报警控制器中，FM 31256芯片的非易失性数据存储器、实时时钟、看门狗等功能，增强系统可靠性。
The nonvolatile data memory, real-time clock, and watchdog functions of FM31256 chip were adopted by region fire alarm and control device to improve the system reliability.
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