实时时钟电路（X1228）被用作里程表，数据存储器和车速表中的警报。
A real-time clock circuit(X1228)is applied to be an hourmeter, data memorizer and alarm in speedometer.
本控制系统以高性能8位单片机at89c52为核心，结合数据采集电路、信号输出电路、实时时钟电路、系统监控电路组成。
The control system is composed of AT89C52, a high-powered 8-bit microcontroller, data gathering circuit, real time circuit, data output circuit and system watch circuit.
利用AT 89s51单片机及实时时钟集成电路ds1643，设计了一个电子钟系统，实现了日期、时间显示及报时功能。
Use AT89S51 single chip and real-time clock integrated circuit DS1643, designed an electronic clock system, realized the date, time display and reported time.
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