摘要
MSI可编程计数器74LS161是同步二进制加法计数器,常规使用是构成各种不同进制的加法计数器。文中探讨了MSI可编程计数器74LS161的逻辑功能扩展问题,目的是探索MSI可编程计数器进行非常规使用改变应用方向的逻辑修改技术,即对可编程计数器74LS161的状态输出进行逻辑修改,改变计数规律,将状态输出反馈到预置数输入端实现"次态=预置数"的时序关系,从而实现逻辑功能扩展。所述方法的创新点是提出了MSI可编程计数器改变应用方向的逻辑修改方法。
The MSI based programmable counter 74LS161 is a sync binary accumulator, and is conventionally used as an accumulator with different digital systems. The logical function extension for MIS-based counter 74LS161 is discussed to develop its unconventional use, in which the logical modification technology is adopted to change its application direction, that is to say, the state output of 74LS161 is logically modified to change its counting regulation so that the state output is back fed to the input end of the setting data to reach the time sequence of “next state： setting data”, and thus the logical function extension is realized. The creative part is that the logical modification technology is proposed to change the application direction of MSI-based programmable counter.
出处
《现代电子技术》
2011年第7期170-171,174,共3页
Modern Electronics Technique
关键词
可编程计数器
逻辑修改
逻辑功能扩展
应用方向
programmable counter
logical modification
logical function extension
application direction
