In electric power system, Digital Program Controlled Exchange has been used broadly because communications requests high reliability.
在电力系统中，由于对通信的可靠性要求较高，因此程控数字交换机正在得到广泛的应用。
The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks.
以电路交换和数字程控交换技术为基础的电话网更是在整个通信网中占据着重要的地位。
This paper introduces hardware constitution and software design of digital clock controlled by 8031 single-chip microcomputer, and its assembly language program is given.
介绍了用8031单片机控制的电脑数字钟的硬件结构与软件设计，给出了汇编语言源程序。
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