共查询到20条相似文献，搜索用时 703 毫秒
1.
I2C总线在51系列单片机系统中的实现 总被引：1，自引：0，他引：1
MCS-51系列、MCS-96系列等单片机由于都不带I2C总线接口而限制了其在I2C总线接口器件的使用.文中介绍了I2C总线的特征和时序,并以串行E2PR0M为例,给出了在51系列单片机上使用并行I/0口实现I2C总线接口的硬件电路和相关软件程序. 相似文献
2.
3.
提出一种能应用于单片机系统的小键盘设计方案,该方案将价格便宜的PC机标准键盘改装,利用了标准键盘的全部功能,单片机只需编程就可使用键盘,能节省许多开发时间,提高设备的稳定性。介绍了键盘接口的PS/2通信协议,给出了与单片机接口的软件原理及C语言程序。 相似文献
4.
陈书墉 《泉州师范学院学报》2002,20(2):33-37
8 2 5 9A可扩展外部中断源的数目 ,又有多种中断管理方式 .文中阐述 82 5 9A的内部结构、中断操作功能和执行中断过程并介绍与单片机的接口电路和应用程序 .该接口电路解决了锁存器与译码器之间的接口方式问题 ,又克服了 82 5 9A与MCS - 5 1系列芯片的信号的不兼容性 .因此 ,只要在程序中利用相应的指令 ,就可产生 82 5 9A所需的中断应答信号 . 相似文献
5.
詹国华 《实验室研究与探索》1999,18(2):58-61
在研究SICEII仿真器的工作模式和有关接口电路特性的基础上,提出了一组基于SICEII仿真器的接口实验,能较好地满足MCS-51单片微机原理和应用课程的实验需要. 相似文献
6.
给出了一种单片机系统与标准PC键盘的接口模块.介绍了测取键盘串行数据具体情况的方法,分 析了接口模块的工作原理与软件编程思想.采用该设计可以简化键盘电路及程序的设计,而且具有通用性. 相似文献
7.
简要介绍高性能价格比单片机AT89C2 0 5 1的主要特性 ,并介绍目前较常用的LQ16 0 0K通用打印机与AT89C2 0 5 1的接口及编程 相似文献
8.
介绍实时时钟芯片DS12C887的特点和工作特性,利用单片机实现与DS12C887的硬件接口以及相应的软件设计. 相似文献
9.
讨论了51系列单片机与E^2PROM进行串行数据传输的实现方法,给出了其硬件接口电路和接口程序． 相似文献
10.
王为国 《中国基础教育研究》2008,4(8)
文章采用ZLG7290芯片,能驱动8位共阴式数码管的智能显示驱动芯片。该芯片不仅可连接多达64键的键盘矩阵,而且还支持12C通讯接口,节省与单片机的连线。单片可完成LED显示、键盘接口的全部功能。文中给出了详细单片机原理设计与通讯接口编程。 相似文献
11.
Zhao Y Li DS Xing SX Yang DR Jiang MH 《Journal of Zhejiang University. Science. B》2005,6(11):1135-1140
INTRODUCTION Porous silicon (PS) attracts the attention of many researchers due to the possibility of developing PS based devices, including optoelectronics, photo re- sistors, solar cells and light emitting diodes (Balucani et al., 1999; Palma et al., 1999a; Stievenard and Deresmes, 1995). To integrate PS into electronic circuits or to develop PS based devices, the electrical properties of this material must be studied thoroughly. It is a difficult case because this material has a ve… 相似文献
12.
针对一种基于USB的无线触摸鼠标板的设计与实现方法,给出了较为详细的设计和实现过程。该设计结合了USB和无线设备的优点,将手持端的鼠标触摸板控制信息通过无线发送到接收端并通过USB接口与主机PC实现交互通信。整个系统主要由PIC16F877A单片机,PDIUSBD12芯片,CC2420无线模块,PS/2鼠标触摸板实现。 相似文献
13.
用于乙醇-水分离的SA-PVA/PSF中空纤维渗透汽化复合膜 总被引：1，自引：1，他引：0
Using polysulfone (PSF) hollow fiber ultrafiltration membranes as the substrate, sodium alginate (SA) and polyvinyl alcohol (PVA) blend solutions as the coating solution, and maleic anhydride (MAC) as the cross-linked agent, SAPVA/PSF hollow fiber composite membranes were prepared for the dehydration of ethanol-water. The effects of different sodium alginate concentration in the coating solutions and different operating temperatures on pervaporation performance were investigated. The experimental results showed that pervaporation performance of the SA-PVA/PSF composite membranes for ethanol-water solution exhibited a high separation factor although they had a relatively low permeation flux. As SA concentration in SA-PVA coating solution was 66.7% and the operating temperature was 40 ℃, SA-PVA/PSF hollow fiber composite membrane (PS4) had a separation factor of 886 and flux of 12.6 g/(m2·h). Besides, SA-PVA/PSF hollow fiber composite membranes (PS3 and PS4) were used for the investigation of the effect of ethanol concentration in the feed solution on pervaporation performance. 相似文献
14.
Using polysulfone (PSF) hollow fiber ultrafiltration membranes as the substrate, sodium alginate (SA) and poly-vinyl alcohol (PVA) blend solutions as the coating solution, and maleic anhydride (MAC) as the cross-linked agent, SA-PVA/PSF hollow fiber composite membranes were prepared for the dehydration of ethanol-water. The effects of differentsodium alginate concentration in the coating solutions and different operating temperatures on pervaporation performance wereinvestigated. The experimental results showed that pervaporation performance of the SA-PVA/PSF composite membranesfor ethanol-water solution exhibited a high separation factor although they had a relatively low permeation flux. As SAconcentration in SA-PVA coating solution was 66.7% and the operating temperature was 40 C, SA-PVA/PSF hollow fibercomposite membrane (PS4) had a separation factor of 886 and flux of 12.6 g/(m2.h). Besides, SA-PVA/PSF hollow fibercomposite membranes (PS3 and PS4) were used for the investigation of the effect of ethanol concentration in the feed solutionon pervaporation performance. 相似文献
15.
高霞 《洛阳师范学院学报》2013,(11):69-72
介绍了一种基于STM32微控制器的低功耗、高性能的温棚环境显示终端的解决方案,阐述了UC/OS操作系统以及UCGUI图形界面系统在STM32上的移植以及人机交互界面的实现.证明了该系统操作简单,便于升级,能实现温湿度以及光度数据的波形显示,同时能实现良好的人机交互. 相似文献
16.
通过对PS版卷筒生产线控制系统的研究分析,应用PLC控制技术对PS版旧生产线继电器控制系统实施改造,设计了基于PLC的控制系统改造方案。该方案提高了系统的自动化程度及可靠性,将为该生产线维护成本的降低和生产效率的提高提供一种可行的解决方案。 相似文献
17.
In this work, polypropylene （PP）/polystyrene （PS） blends with different organoclay concentrations were prepared via melt compounding. Differing from the results of previous reports, the organoclay platelets are mostly located in the dispersed PS phase instead of the interface. The dimensions of the dispersed PS droplets are greatly reduced and apparent compatibilization effect still exists, which cannot be explained by the traditional compatibilization mechanism. A novel compatibilization mechanism, ＂cutting＂ to apparently compatibilize the immiscible PP/PS blends was proposed. The organoclay platelets tend to form a special ＂knife-like structure＂ in the PS domain under the shear stress of the continuous PP phase during compounding. The ＂clay knife＂ can split the dispersed PS domain apart and lead to the dramatic reduction of the dispersed domain size. 相似文献
18.
INTRODUCTIONPhytoremediation,thatuseofgreenplantstodecontaminateCuandotherheavymetalsinsoils,isanemergingtechniquewithadvantagesofbeinginsitu,cost-effectiveandenvironmentallysus-tainable(Chanyetal.,1997;Cunninghametal.,1997;Saltetal.,1998).Theavailabilityofmetalinthesoilforplantuptakeisoneimportantlimitationforsuccessfulphytoremediation(Blaylocketal.,1997).Forexample,lead(Pb)isoneofthemostimportantenvironmentalpollutants,haslimitedsolubilityinsoils,andisavailableforplantuptakeduetocompl… 相似文献
19.
Phytoremediation is emerging as a potential cost-effective solution for remediation of contaminated soils, and bioavailability of metal in the soil for plant uptake is an important factor for successful phytoremediation. This study aimed at investigating the ability of EDTA and citric acid for enhancing soil bioavailability of Cu and phytoremediation by Elsholtzia splendens in two types of soils contaminated with heavy metals [i.e. mined soil from copper mining area (MS), and paddy soil (PS) polluted by copper refining]. The results showed that addition of 2.5 mmol/kg EDTA significantly increased the H2O extractable Cu concentration from 1.20 to 15.78 mg/kg in MS and from 0.26 to 15.72 mg/kg in PS, and that shoot Cu concentration increased 4-fold and 8-fold as compared to the control. There was no significant difference between the treatment with 5.0 mmol/kg EDTA and that with 2.5 mmol/kg EDTA, probably because that 2.5 mmol/kg EDTA was enough for elevating Cu bioavailability to the maximum level. As compared with the control, citric acid had no marked effect on both soil extractable Cu and shoot Cu concentration or accumulation. The results indicated that EDTA addition can increase the potential and efficiency of Cu phytoextraction by E. splendens in polluted soils. 相似文献
20.
A variety of barium sulfate （BaSO4） carriers with or without mesopore structure were synthesized via precipitation reaction in aqueous solution of barium hydroxide and sulfuric acid with ethylene glycol as a modifying agent, and then calcined at various temperatures. The obtained BaSO4 was used as catalyst carriers for polystyrene （PS） hydrogenation, and BaSO4 supported palladium （Pd） catalysts with Pd content of 5wt% were prepared by using impregnation method. N2 physisorption, transmission electron microscopy, X-ray diffraction and kinetics studies were used to investigate the effect of carrier structure on the dispersion and geometric location of active metal and their catalytic activities in PS hydrogenation. It was found that the pore structure of carrier played an important role in the dispersion and location of Pd grains. The activation energy values for all the Pd/BaSO4 catalysts were around 49.1 kJ/mol, while the pre-exponential factor for Pd/BSC-6H was much higher than others. The Pd/BSC-6H without mesopores had Pd grains deposited on the external surface of the carrier, and exhibited better activity than the mesoporous catalysts. It is indicated that the utilization of Pd/BSC-6H can reduce the pore diffusion of PS coils and enabled more active sites to participate in the PS hydrogenation. 相似文献