Grammatica is a C# and Java parser generator (compiler compiler). It improves upon simlar tools (like yacc and ANTLR) by creating well-commented and readable source code, by having automatic error recovery and detailed error messages, and by support for testing and debugging grammars without generating source code. It supports LL(k) grammars with an unlimited number of look-ahead tokens.
標(biāo)簽： compiler Grammatica generator improves
上傳時(shí)間： 2015-01-11
上傳用戶：stella2015
介紹幾種cpuThe 8xC251SA/SB/SP/SQ improves on the MCS-51 architecture and peripheral features, introducing the advanced register based CPU architecture i.e., the MCS 251 microcontroller architecture. The register based CPU supports a 40-byte register file. In addition, the 8xC251SA/SB/SP/SQ microcontroller has 256-Kbyte expanded external code/data memory space and 64-Kbyte stack space. The new controller is also specially designed to execute C code efficiently. More importantly, the 8xC251SA/SB/SP/SQ maintains binary code compatibility with MCS 51 microcontrollers but at the same time allows the use of the powerful MCS 251 microcontroller instruction set, with many new 8, 16 and 32 bit instructions available. The 8xC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip data RAM options and is available in 16 Kbytes and 8 Kbytes of on-chip ROM/OTPROM or ROMless options.
標(biāo)簽： architecture introducin peripheral improves
上傳時(shí)間： 2015-03-15
上傳用戶：ccclll
W-CDMA Power supply dramatically improves transmit efficiency
標(biāo)簽： dramatically efficiency improves transmit
上傳時(shí)間： 2014-11-29
上傳用戶：mhp0114
The TLE2425 improves input regulation as well as output regulation
標(biāo)簽： regulation improves output input
上傳時(shí)間： 2013-12-23
上傳用戶：libenshu01
In addition to simplifying design problems, a family of dedicatedchips improves stepper-motor drive-
上傳時(shí)間： 2013-05-25
上傳用戶：stella2015
While simplicity and high effi ciency (for cool running) areno longer optional features in isolated power supplies, itis traditionally diffi cult to achieve both. Achieving higheffi ciency often requires the use of advanced topologiesand home-brewed secondary synchronous rectifi cationschemes once reserved only for higher power applications.This only adds to the parts count and to the designcomplexity associated with the reference and optocouplercircuits typically used to maintain isolation. Fortunately, abreakthrough IC makes it possible to achieve both high efficiency and simplicity in a synchronous fl yback topology.The LT®3825 simplifi es and improves the performance oflow voltage, high current fl yback supplies by providingprecise synchronous rectifi er timing and eliminating theneed for optocoupler feedback while maintaining excellentregulation and superior loop response.
上傳時(shí)間： 2013-10-16
上傳用戶：wayne595
Today’s computer, datacom, and telecom systems demandpower supplies that are effi cient, respond quicklyto load transients and accurately regulate the voltageat the load. For example, load current can be measuredby using the inductor DCR, thus eliminating the needfor a dedicated sense resistor. Inductor DCR sensingincreases effi ciency—especially at heavy load—whilereducing component cost and required board space.The LTC®3856 single-output 2-phase synchronous buckcontroller improves the accuracy of inductor DCR sensingby compensating for changes in DCR due to temperature.
上傳時(shí)間： 2013-11-05
上傳用戶：guobing703
The latest generation of Texas Instruments (TI) boardmountedpower modules utilizes a pin interconnect technologythat improves surface-mount manufacturability.These modules are produced as a double-sided surfacemount(DSSMT) subassembly, yielding a case-less constructionwith subcomponents located on both sides of theprinted circuit board (PCB). Products produced in theDSSMT outline use the latest high-efficiency topologiesand magnetic-component packaging. This providescustomers with a high-efficiency, ready-to-use switchingpower module in a compact, space-saving package. Bothnonisolated point-of-load (POL) switching regulators andthe isolated dc/dc converter modules are being producedin the DSSMT outline.TI’s plug-in power product line offers power modules inboth through-hole and surface-mount packages. The surfacemountmodules produced in the DSSMT outline use asolid copper interconnect with an integral solder ball fortheir
上傳時(shí)間： 2013-10-10
上傳用戶：1184599859
為解決我國(guó)水位監(jiān)測(cè)野外條件下長(zhǎng)期無(wú)人看守的問(wèn)題，研制開(kāi)發(fā)了基于MSP430單片機(jī)的智能水位計(jì)。從其組成到各功能分別進(jìn)行了詳細(xì)的介紹，該智能水位計(jì)不僅實(shí)現(xiàn)了水位數(shù)據(jù)的實(shí)時(shí)監(jiān)測(cè)、記錄和定期采集等多種工作模式，而且提高了水位監(jiān)測(cè)精度，實(shí)現(xiàn)了水位監(jiān)測(cè)的智能化。 Abstract: In order to solve the problems of long-term unmanned observation in the field water monitoring，an intelligence water-level meter based on MSP430 is developed composition and every function moduce of the water level meter was introduced in detail. It not only realizes water level data collection and storage， regularly gathering and so on， but also improves the water-level precision ， finally realizes the intelligence.
標(biāo)簽： MSP 430 單片機(jī) 水位計(jì)
上傳時(shí)間： 2013-11-17
上傳用戶：417313137
為提高太陽(yáng)能的利用率，以ATmega8單片機(jī)為控制核心，設(shè)計(jì)了一套光電跟蹤與視日運(yùn)動(dòng)軌跡跟蹤互補(bǔ)控制的雙軸太陽(yáng)跟蹤器。該跟蹤器在晴天時(shí)，利用光敏電阻采集光強(qiáng)判斷太陽(yáng)位置,控制步進(jìn)電機(jī)實(shí)現(xiàn)光電跟蹤；在陰天時(shí)，采集時(shí)鐘器件PCF8583的時(shí)間信息,計(jì)算當(dāng)前太陽(yáng)位置來(lái)實(shí)現(xiàn)視日運(yùn)動(dòng)軌跡跟蹤。實(shí)驗(yàn)表明：該太陽(yáng)跟蹤器能在不同天氣狀況下對(duì)太陽(yáng)進(jìn)行較準(zhǔn)確地跟蹤，能量接收效率提高了30%，達(dá)到充分利用太陽(yáng)能的目的。 Abstract: To improve the utilization rate of solar energy，a kind of solar tracking controller which effectively combined the sun angle tracking and photo electric tracking based on ATmega8is designed.In the sunny days，the solar tracking con-troller determines the sun's position by using photosensitive resistances to collect light intensity and control stepper motors to achieve photo electric tracking，n cloudy days，it collects clock chip PCF8583time information to calculate the current position of the sun and achieve the sun angle tracking.Experimental results show the solar tracking controller accurately tracks the sun in different weather conditions，improves received energy efficiency by30%and reaches the purpose of full use of solar energy.
上傳時(shí)間： 2013-10-15
上傳用戶：urgdil
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