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1.
DS1302在单片机系统中的应用 总被引：4，自引：0，他引：4
讨论了实时时钟／日历芯片DS1302在单片机系统中的应用．以英特尔80C196单片机为例，给出了硬件接口电路和PLM语言编写的读写驱动程序．这些程序已通过验证并应用到电力系统监控终端中．该方法占用CPU硬件资源少，软件设计简单。 相似文献
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许晓勤 《荆门职业技术学院学报》2008,23(9)
介绍国内外注塑机节电控制系统的发展情况及注塑机变频调速原理,并设计出以电机控制专用单片机80C196MC和型号为PM20CSJ060的智能功率模块(IPM)为核心的变频调速器。最后探讨了针对定量泵及电机本身存在的缺陷的软件补偿措施。 相似文献
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为解决软件延时驱动步进电机占用大量CPU资源的问题，提出了用硬件延时节约CPU资源，用于其它目标控制或运算的方法。并设计了一种与单片机89C51接口的硬件延时中断驱动步进电机的接口电路。 相似文献
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本文介绍了80C196单片机驱动比例电磁阀,进而对真空调节的EGR系统进行控制,来降低CA498的排放值,特别是NOX的排放值,并对其进行试验.结果表明:采用EGR系统后CA498的排放量下降明显. 相似文献
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本文介绍了汽车灯光自动控制系统的国内外研究现状,并给出了实现方案;讨论了汽车灯光自动控制系统设计原理;给出了用Freescale 16位单片机MC9S12C32和信号检测芯片MC33993、功率驱动芯片MC33888等组成的汽车灯光自动控制系统具体电路原理图,并技术问题提出了解决方案。 相似文献
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采用单片机Atmel89C51设计了四相步进电动机的驱动系统,并对单片机直接进行脉冲分配控制电机进行了论述.此系统硬件结构简单,但占用较多CPU时间.当在驱动系统中增加脉冲分配芯片L297后,就使CPU时间得到释放,提高了系统的响应速度. 相似文献
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彭涛 《中小学信息技术教育》2003,(Z1)
学校校园网工作站使用的计算机不同于校园网中的服务器和家庭使用的多媒体计算机,工作站只要能够满足学生或教师的学习和工作需要即可,我们可以在Intel、AMD、VIA这三个目前主流的PC CPU中进行选择。这三种CPU是三种不同的系统架构,它们各自的性能不同,价格也不同。我们可以通过它们的实用性、可靠性、经济性、应用性几方面来进行比较。 Intel目前主推的是奔腾4CPU和赛扬4 CPU,以前的赛扬2和赛扬3(图拉丁赛扬)已经被Intel淘汰。奔腾4和赛扬4的CPU售价比其他两款CPU高出不少,最低主频的奔腾4售价在1000元左右,赛扬4也在600 相似文献
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介绍一种利用80C196单片机为基础所构成的电机实验教学监控与保护系统，并简述其硬件组成结构和控制软件的功能。 相似文献
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自从1977年Intel公司推出Intel8086以来,微机CPU经历了8086/8088、80286、80386、80486、Pentium、Pentium Pro等许多代的发展,然而在激烈的市场竞争中Intel的领袖地位始终没有动摇。究其原因,一方面是由其先进的技术作后盾,另一方面,与Intel公司的市场策略也不无关系。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献