MCSÉ-51 Programmer's Guide and Instruction Set The information presented in this chapter is collected from the MCSÉ-51 Architectural Overview and the HardwareDescription of the 8051, 8052 and 80C51 chapters of this book. The material has been selected and rearranged toform a quick and convenient reference for the programmers of the MCS-51. This guide pertains specifically to the8051, 8052 and 80C51.
上傳時間： 2013-11-13
上傳用戶：hj_18
LTC1732 是LINEAR TECHNOLOGY 公司推出的鋰離子電池充電控制集成電路芯片。它具有電池插入檢測和自動低壓電池充電功能。文章介紹了該芯片的結構、特點、工作原理及應用信息，給出了典型的應用電路。 LTC1732 是LINEAR TECHNOLOGY 公司生產的鋰-離子（Li-離子）電池恒流/恒壓線性充電控制器。它也可以對鎳-鎘（NiCd）和鎳-氫（NiMH）電池恒流充電。其充電電流可通過外部傳感電阻器編程到7%（最大值）的精度。最終的浮動電壓精度為1%。利用LTC1732 的SEL 端可為4.1V 或4.2V 電池充電。當輸入電源撤消后，LTC1732 可自動進入低電流睡眠狀態，以使消耗電流下降到7μA。LTC1732 的內部比較器用于檢測充電結束條件（C/10），而總的充電時間則是通過可編程計時器的外部電容來設置的。在電池完全放電后，控制器將自動以規定電流的10%對被充電電池進行慢速充電直到電池電壓超過2.457V。當放電后的電池插入充電器或當輸入電源接通時，LTC1732 將開始重新充電。另外，如果電池一直插入在充電器且在電池電壓降到3.8V（LTC1732-4）或4.05V（LTC1732-4.2）以下時，充電器也將開始重新充電。LTC1732 的其它主特點如下：●具有1%的預置充電電壓精度；●輸入電壓范圍4.5V～12V；●充電電流可編程控制；●具有C/10 充電電流檢測輸出；●可編程控制充電終端計時；●帶有低電壓電池自動小電流充電模式；●可編程控制恒定電流接通模式；●具有電池插入檢測和自動低壓電流充電功能；●帶有輸入電源（隔離適配器）檢測輸出；●LTC1732-4.2 型器件的再充電閾值電壓為4.05V；●LTC1732-4 型器件的再充電閾值電壓為3.8V。
上傳時間： 2013-11-12
上傳用戶：semi1981
提出了一種改進的LSM-ALSM子空間模式識別方法，將LSM的旋轉策略引入ALSM，使子空間之間互不關聯的情況得到改善，提高了ALSM對相似樣本的區分能力。討論中以性能函數代替經驗函數來確定拒識規則的參數，實現了識別率、誤識率與拒識率之間的最佳平衡；通過對有限字符集的實驗結果表明，LSM-ALSM算法有效地改善了分類器的識別率和可靠性。關 鍵 詞 學習子空間; 性能函數; 散布矩陣; 最小描述長度在子空間模式識別方法中，一個線性子空間代表一個模式類別，該子空間由反映類別本質的一組特征矢量張成，分類器根據輸入樣本在各子空間上的投影長度將其歸為相應的類別。典型的子空間算法有以下三種[1, 2]：CLAFIC(Class-feature Information Compression)算法以相關矩陣的部分特征向量來構造子空間，實現了特征信息的壓縮，但對樣本的利用為一次性，不能根據分類結果進行調整和學習，對樣本信息的利用不充分；學習子空間方法(Leaning Subspace Method, LSM)通過旋轉子空間來拉大樣本所屬類別與最近鄰類別的距離，以此提高分類能力，但對樣本的訓練順序敏感，同一樣本訓練的順序不同對子空間構造的影響就不同；平均學習子空間算法(Averaged Learning Subspace Method, ALSM)是在迭代訓練過程中，用錯誤分類的樣本去調整散布矩陣，訓練結果與樣本輸入順序無關，所有樣本平均參與訓練，其不足之處是各模式的子空間之間相互獨立。針對以上問題，本文提出一種改進的子空間模式識別方法。子空間模式識別的基本原理1.1 子空間的分類規則子空間模式識別方法的每一類別由一個子空間表示，子空間分類器的基本分類規則是按矢量在各子空間上的投影長度大小，將樣本歸類到最大長度所對應的類別，在類x()iω的子空間上投影長度的平方為()211,2,,()argmax()jMTkkjpg===Σx (1)式中 函數稱為分類函數；為子空間基矢量。兩類的分類情況如圖1所示。
上傳時間： 2013-12-25
上傳用戶：熊少鋒
摘 要:用一種新的思路和方法,先計算低通、再計算高通濾波器的有關參數,然后組合成帶通濾波器.關鍵詞:濾波器;參數;新思路中圖分類號: TN713. 5 文獻識別碼:B 文章編號:1008 - 1666 (1999) 04 - 0089 - 03A New Consideration of the Band Filter’s CalculationGuo Wencheng( S hao Yang B usiness and Technology school , S haoyang , Hunan ,422000 )Abstract :This essay deals with a new method of calculating the band filters - first calculatingthe relevant parameters of low - pass filters ,then calculating the ones of high - pass filters.Key words :filter ; parameters ;new considercation八十年代后,信息產業得到了迅猛發展. 帶通濾波器在微波通信、廣播電視和精密儀器設備中得到了廣泛應用. 帶通濾波器性能的優劣,對提高接收機信噪比,防止鄰近信道干擾,提高設備的技術指標,有著十分重要的意義.我在長期的教學實踐中,用切比雪夫型方法設計、計算出寬帶濾波器集中參數元件的數據. 該濾波器可運用在檢測微波頻率的儀器和其他設備中. 再將其思路和計算方法介紹給大家,供參考.
上傳時間： 2014-12-28
上傳用戶：Yukiseop
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8Kbytes of Flash programmable and erasable read only memory (PEROM). The deviceis manufactured using Atmel’s high-density nonvolatile memory technology and iscompatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memory to be reprogrammed in-system or by aconventional nonvolatile memory programmer. By combining a versatile 8-bit CPUwith Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputerwhich provides a highly-flexible and cost-effective solution to many embedded controlapplications.
上傳時間： 2013-11-10
上傳用戶：1427796291
The Hardware Book (WinHelp32) Information from The Hardware Book
上傳時間： 2013-11-23
上傳用戶：cepsypeng
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their productsor to discontinue any product or service without notice, and advise customers to obtain the latestversion of relevant information to verify, before placing orders, that information being relied onis current and complete. All products are sold subject to the terms and conditions of sale suppliedat the time of order acknowledgement, including those pertaining to warranty, patentinfringement, and limitation of liability
上傳時間： 2013-12-26
上傳用戶：凌云御清風
Introduction to Xilinx Packaging Electronic packages are interconnectable housings for semiconductor devices. The major functions of the electronic packages are to provide electrical interconnections between the IC and the board and to efficiently remove heat generated by the device. Feature sizes are constantly shrinking, resulting in increased number of transistors being packed into the device. Today's submicron technology is also enabling large-scale functional integration and system-on-a-chip solutions. In order to keep pace with these new advancements in silicon technologies, semiconductor packages have also evolved to provide improved device functionality and performance. Feature size at the device level is driving package feature sizes down to the design rules of the early transistors. To meet these demands, electronic packages must be flexible to address high pin counts, reduced pitch and form factor requirements. At the same time,packages must be reliable and cost effective.
上傳時間： 2013-10-22
上傳用戶：ztj182002
Abstract: This application note discusses the development and deployment of 3G cellular femtocell base stations. The technicalchallenges for last-mile residential connectivity and adding system capacity in dense urban environments are discussed, with 3Gfemtocell base stations as a cost-effective solution. Maxim's 3GPP TS25.104-compliant transceiver solution is presented along withcomplete radio reference designs such as RD2550. For more information on the RD2550, see reference design 5364, "FemtocellRadio Reference Designs Using the MAX2550–MAX2553 Transceivers."
標簽： Base-Station Applications Single-Chip Transceiver
上傳時間： 2013-11-07
上傳用戶：songrui
This application note provides users with a general understanding of the SVF and XSVF fileformats as they apply to Xilinx devices. Some familiarity with IEEE STD 1149.1 (JTAG) isassumed. For information on using Serial Vector Format (SVF) and Xilinx Serial Vector Format(XSVF) files in embedded programming applications
上傳時間： 2013-10-21
上傳用戶：tiantwo
