48 resultados para flash card


Relevância:

10.00% 10.00%

Publicador:

Resumo:

MSC1212系列微控制器内部集成了8通道24位高精度Δ-∑ ADC、4通道16位DAC、32kB的闪速存储器以及1.2kB的静态数据存储器,还有丰富的外设资源本文主要介绍内核兼容8051的MSC1212微控制器结构特点、ADC通道、DAC通道以及Flash编程模式等功能

Relevância:

10.00% 10.00%

Publicador:

Resumo:

MSC1211是一种用于数据获取的片上系统微控制器,其集成了嵌入式的24位高精度∑-△A/D转换器和16位D/A转换器。文中主要介绍内核兼容8051的MSC1211单片机结构特点,ADC通道,DAC通道以及Flash编程模式等功能。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

在HIRFL-CSR(兰州重离子冷却储存环)电源控制系统中,Kicker电源需要控制器提供高压充电电压基准电压信号和触发信号,采集基准电压信号,将电源充电电压与期望值进行比较,如果有偏差,则进行修正,使实际值与期望值一致。为Kicker电源设计的电源控制器采用DSP作为处理器,采用串行DAC为电源提供基准电压波形,基准电压信号回读用并行ADC来完成。论文首先简要介绍了Kicker电源系统,根据控制器的设计要求,选用TI公司的TMS320VC5402芯片,给出了控制器的总体设计。其次,具体介绍了TMS320VC5402的结构、外围设备,给出了电路设 计原理图,以及与存储器连接电路图,并分别介绍了硬件系统各个部分的电路设计以及FPGA部分设计。再次,介绍了DSP编程环境CCS,给出了FLASH擦写过程以及二次下载原理,并详细论述了基准电压信号发送的编写,并对回读的基准电压信号进行了滤波处理。最后,对电源控制器的设计进行了总结。论文完成了Kicker磁铁电源控制器的硬件设计和底层软件设计,为以后在该硬件平台上下一步工作打下了坚实的基础

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Herpetineurontoccoae(Sull.et.Lesq.)Card.〕、(ThuidiumkanedaeSak.)、〔Claopodiumpellucinerve(Mitt.)Best.〕、〔Anomodonrugelii(C.Mll.)Keissl.〕、Haplohymeniumtriste(Ces.)Kindb.〕〔Lescuraeapatens(Lindb.)Arn.etJens〕、(LeskeapolycarpaEhrh.exHedw.)、〔Bryohaplocladiummicrophyllum(Hedw.)R.WatanabeetIwats〕、(FauriellatenerrimaBroth.)Bryohaplocladiumangustifolium(HampeetC.M櫣ll.)R.WatanabeetIwats.〕HaplohymeniumDoz.etMolk.)、(AnomodonHook.etTayl.)、属〔Herpetineuron(C.M櫣ll.)Card.〕(Anomodontaceae)是合理的;小羽藓属(BryohaplocladiumR.WatanabeetIwats.)Claopodium(Lesq.etJam.)RenetCard.〕Leskeaceae)。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Fluorescence of terbium(III) was sensitized when excited in the presence of sparfloxacin (SPFX) in the aqueous solution because a Tb(III)-SPFX complex was formed. The sensitized fluorescence was further enhanced when this system was exposed to 365 nm ultraviolet light. By the spectral properties and contrast experiments, it is proved that irradiation makes this system undergo photochemical reactions and a new terbium complex which is more favorable to the intramolecular energy transfer is formed. The mechanism of photochemical fluorescence enhancement of the Tb(III)-SPFX system is discussed and a new sensitive and selective photochemical fluorimetry for the determination of SPFX is established. Under the optimum conditions, the linear range is 1.0-50 x 10(-7) M for SPFX, the detection limit is 3.0 x 10(-9) M and the R.S.D. for 5.0 x 10(-7) M SPFX is 1.3% (n = 9). Without any pretreatment the recovery of SPFX in human urine was determined with satisfaction. (C) 1999 Elsevier Science B.V. All rights reserved.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

(Y1-xEux)(3)Al5O12 and (Y1-x-yEuxBiy)(3)Al5O12 were prepared by so-gel method. Their structures of the luminophor are similar to that of YAG, which is recorded on the ASTM card and belongs to a cubic system. The luminescent properties show that the reaction temperature of the current sol-gel method is in the range of 400-500 degrees C, which is lower than that of the conventional solid state reaction. The luminophors have the strongest emission intensity when the values of x and y are 0.06 and 0.013, respectively.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

利用~(13)C-NMR方法研究了弱碱K_2CO_3存在下酚酞成盐反应及其与活性双卤砜亲核缩聚反应过程中的结构特征。对一系列碱性条件下酚酞(PP)与4,4'-二氯二苯砜(DCDPS)的缩聚反应的研究表明任何影响内酯结构酚酞盐生成的因素都会严重阻碍聚合反应的进行。对模型化合物存在下K_2CO_3在极性非质子溶剂中的溶解/解离行为的研究结果表明酚酞类Card。双酚与固体K_2CO_3之间可能存在着一种特殊的络合作用。基于我们系列研究结果,本文中总结提出了弱碱K_2CO_3存在下酚酞的反应机理。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

长期、定点、连续测量海洋环境参数,尤其是从海洋表面到海底的垂直剖面的监测一直以来大都是由船只完成,耗费大量的人力和财力。“海浪驱动自持式海洋要素垂直剖面测量系统”(简称“海马”)利用海洋无时不在的波浪能,驱动滑行器单方向下潜运动,直达海底或程序设定的预定深度,在控制系统作用下,滑行器依靠自身的浮力匀速上浮, 并在此过程中,完成海洋要素的自动测量和存储。 当今海洋仪器大多采用“闪存”来存储数据,主要有RS-232串口和并型口的CF(Compact Flash)卡两种形式。但是两种接口都有一定的缺陷:CF卡不能和PC机直接通信,必须通过转接口才能将数据传送到PC机上;而RS-232接口虽然可以和PC机直接通信,但是由于其传输速度较慢,不利于大量数据的传输。由于上述两种接口的缺点,“海马”采用U盘来实现数据的存储。 USB接口不仅可以和PC机直接通信,而且具有使用方便,数据传输率高,又支持即插即用等特点,但由于USB接口协议复杂,涉及的方面广,特别是软件种类比较多,而且USB芯片种类繁多,使得USB设备的开发非常困难。 本文设计的USB(Universal Serial Bus)接口电路以单片机AT89C51以及CYPRESS公司生产的USB接口芯片SL811HS为核心,结合了随机存储芯片HY62256以及看门狗芯片X25165。在介绍了SL811HS控制器芯片的主要特点的基础上,重点阐述了利用这一芯片在C语言的编程控制之下如何识别U盘的插入和拔出,以及如何将单片机的数据按协议规定写入U盘,其中的协议包括FAT文件协议,USB协议和UFI命令协议。 本系统实现了单片机对U盘的数据存储,速度快,存储容量大,数据读取方便,直观明了,系统工作安全可靠,抗干扰能力强,可扩展性大,而且针对下位机设计的串口协议简单,可以满足“海马”海量数据的存储要求。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

CANopen是一种开放的应用层协议,其应用可以进一步提高系统的可靠性、通讯效率及灵活性,而且可以使产品具有很好的兼容性。本文采用CANopen通讯协议实现了CAN总线DSP系统与上位机CAN卡之间的通讯,并通过测试实验验证了信息传递的可靠性,保证了全数字网络化伺服驱动系统中对电机控制的准确性和实时性。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

本文针对排爆机器人手臂多关节联动控制的需要,开发了一种具有高集成度的基于C8051单片机和CAN总线的运动控制卡。介绍了运动控制卡的原理及实施方案,同时给出了运动控制卡在机器人平台的应用实例。在排爆机器人平台上的应用表明该运动控制卡具有较高的精度及很好的可靠性和实时性。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

介绍了一种新型的仿人机器人两自由度腰部结构,给出了该机构两个伺服电机的PID控制策略,建立了基于PC机CAN卡的网络控制平台,该平台可实现腰部机构的实时控制及实时机构控制响应特性分析,该平台还具有扩展性强、成本低的特点。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

为了避免人眼对产品外观质量检测时,人眼视觉疲劳所产生的产品错检、漏检,提出了基于机器视觉的烟支条盒包装质量检测系统的设计。该系统由光源、相机、图像采集卡和工业控制计算机组成视觉系统处理单元,应用定位配准、边缘检测和斑点分析等图像处理算法完成对产品缺陷的检测。该视觉检测系统已经在烟厂得到了实际应用,对今后开发类似的基于机器视觉的产品外观质量检测系统具有一定的参考价值和指导意义。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

带USB接口的设备使用方便,发展迅速,文章结合高速公路车道收费系统中的实际问题,详细介绍了设计一个USB接口通信卡的过程,包括电路设计、器件选择、固件设计、驱动程序及其应用程序设计。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

DSRC标准是ISO/TC204制定的智能交通系统(ITS)中车—路信息通讯的协议。采用双片式ETC电子标签结合双界面IC卡的储值卡方案形成的多功能不停车收费系统,充分兼容了当前国内普遍应用的IC卡半自动收费方式,集中了IC卡收费系统和ETC收费系统的优点,方便、快捷、通行能力强,并解决了收费口的交通拥挤现象。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Our motherland has large area of maritime space. Searching and developing ocean becomes more and more important. So Ocean Bottom Seismometer (OBS) as an absolutely necessary equipment can be used in many oceanic fields. OBS not only is an important instrument for discovering structure of lithosphere of ocean bottom, but also plays a main role of oceanic geophysical exploration. The paper introduces my relational work. The MCI micro-power broad frequency seismometer was developed independently. Its power dissipation is less than 300mW. It has some merits including miniature volumeN light mass and cheap price. It is an ideal device not only for the collection high-resolution natural seismic data, but also for the fields of seismic sounding and engineering seismology. Many new high technique were applied to develop this instrument including over-sampling A/D converter, high performance 32bit Micro Process Unit and Flash memory with smart-media interface. Base on the achievement, I have accomplished the showpiece of OBS, which is applied to the deepwater oil and gas geophysical exploration. Because of micro-power dissipation, the seismograph and the sonar releaser can be integrated into a sphere cabin. By this means, the instrument's frequency of resonance and frequency of couple are improved obviously. The data acquisition system of OBS is improved from MCI seismometer. The capacity of flash memory is enlarge from 1G bytes to 8G bytes. The advance MPU in data acquisition system is used to integrate other function modules such as sonar, GPS, compass and digital transmitter.