real time clock circuit 实时时钟电路
A real-time clock circuit(X1228)is applied to be an hourmeter, data memorizer and alarm in speedometer.
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。
The paper introduces the design of digital clock based on FPGA and VHDL, the time of clock can be displayed with the digital driving circuit.
介绍了利用VHDL硬件描述语言结合FPGA可编程器件进行数字钟的设计，并通过数码管驱动电路动态显示计时结果。
Use AT89S51 single chip and real-time clock integrated circuit DS1643, designed an electronic clock system, realized the date, time display and reported time.
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。
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