如何用计数器实现任意分频

• 作 者: 张赓毅 李凤林
• 出 处: 中国计算机用户
• 发表日期: 1995年03期
• 关键词: 时序逻辑电路 分频电路 石英晶体振荡器 十进制数 二进制码 时钟信号 比较器 计数电路 设计方法 信号输出

分频的目的在于只用一个振荡源(如石英晶体振荡器)通过分频电路得到所需的不同频率的时钟信号。下面介绍如何用计数器实现任意分频的方法。 1.计数器分频 我们知道,由计数器和门电路组成的逻辑电路称为一般时序逻辑电路。 下面以四位二进制加法计数器为例说明设计方法,其真值表见图1。 从真值表中可以看出,计数到0011

The purpose of frequency division is to use only one oscillator (such as quartz crystal oscillator) through the frequency divider circuit to obtain the desired clock signal of different frequencies. The following describes how to use the counter to achieve any frequency method. 1. Counter Division We know that by the counter and gate circuit logic circuit composed of general timing logic. The following four binary addition counter as an example to illustrate the design method, the truth table shown in Figure 1. As can be seen from the truth table, count to 0011