FeaturesThe following standard features are provided.• Choice of RTOS scheduling policy1. Pre-emptive:Always runs the highest available task. Tasks of identical priorityshare CPU time (fully pre-emptive with round robin time slicing).2. Cooperative:Context switches only occur if a task blocks, or explicitly callstaskYIELD().• Co-routines (light weight tasks that utilise very little RAM).• Message queues• Semaphores [via macros]• Trace visualisation ability (requires more RAM)• Majority of source code common to all supported development tools• Wide range of ports and examples
上傳時(shí)間： 2013-10-13
上傳用戶：13162218709
匯編器在微處理器的驗(yàn)證和應(yīng)用中舉足輕重，如何設(shè)計(jì)通用的匯編器一直是研究的熱點(diǎn)之一。本文提出了一種開(kāi)放式的匯編器系統(tǒng)設(shè)計(jì)思想，在匯編語(yǔ)言與機(jī)器語(yǔ)言間插入中間代碼CMDL（code mapping description language）語(yǔ)言，打破匯編語(yǔ)言與機(jī)器語(yǔ)言的直接映射關(guān)系，由此建立起一套描述匯編語(yǔ)言與機(jī)器語(yǔ)言的開(kāi)放式映射體系。基于此開(kāi)放式映射體系開(kāi)發(fā)了一套匯編器系統(tǒng)，具有較高層次上的通用性和可移植性。【關(guān)鍵詞】指令集，CMDL，匯編器，開(kāi)放式 Design of Retargetable Assembler System Liu Ling Feng Wen Nan Wang Ying Chun Jiang An Ping Ji Li Jiu IME of Peking University, 100871【摘要】An assembler plays a very important role in the field of microprocessor verifications and applications, thus how to build a retargetable assembler system has been a hotspot in this field for long time. This paper presents a new method about the retargetable assembler system design.It provides a kind of language CMDL, code mapping description language. During the process of assembling, assembler languages are firstly translated to CMDL, and then mapped to the machine codes. In an other word, CMDL is inserted between assembler languages and machine codes during the translation procedure. As a medium code, CMDL has a lot of features, such as high extraction, strong descript capabilities. It can describe almost all attributes of assembler languages. By breaking the direct mapping relationship between assembler languages and machine codes, the complexities of machine codes are hided to the users, therefore, the new retargetable assembler system has higher retargetable level by converting the mapping from assembler languages and machine codes to assembler languages and CMDL, and implementationof it becomes easier. Based on the new mapping system structure, a retargetable assemblersystem is developed. It proved the whole system has good retargetability and implantability.【關(guān)鍵詞】instruction set, symbol table, assembler, lexical analysis, retargetability
上傳時(shí)間： 2013-10-10
上傳用戶：meiguiweishi
自動(dòng)檢測(cè)80C51串行通訊中的波特率:本文介紹一種在80C51 串行通訊應(yīng)用中自動(dòng)檢測(cè)波特率的方法。按照經(jīng)驗(yàn)，程序起動(dòng)后所接收到的第1 個(gè)字符用于測(cè)量波特率。這種方法可以不用設(shè)定難于記憶的開(kāi)關(guān)，還可以免去在有關(guān)應(yīng)用中使用多種不同波特率的煩惱。人們可以設(shè)想：一種可靠地實(shí)現(xiàn)自動(dòng)波特檢測(cè)的方法是可能的，它無(wú)須嚴(yán)格限制可被確認(rèn)的字符。問(wèn)題是：在各種的條件下，如何可以在大量允許出現(xiàn)的字符中找出波特率定時(shí)間隔。顯然，最快捷的方法是檢測(cè)一個(gè)單獨(dú)位時(shí)間（single bit time），以確定接收波特率應(yīng)該是多少。可是，在RS-232 模式下，許多ASCII 字符并不能測(cè)量出一個(gè)單獨(dú)位時(shí)間。對(duì)于大多數(shù)字符來(lái)說(shuō)，只要波特率存在合理波動(dòng)（這里的波特率是指標(biāo)準(zhǔn)波特率），從起始位到最后一位“可見(jiàn)”位的數(shù)據(jù)傳輸周期就會(huì)在一定范圍內(nèi)發(fā)生變化。此外，許多系統(tǒng)采用8 位數(shù)據(jù)、無(wú)奇偶校驗(yàn)的格式傳輸ASCII 字符。在這種格式里，普通ASCII 字節(jié)不會(huì)有MSB 設(shè)定，并且，UART總是先發(fā)送數(shù)據(jù)低位（LSB），后發(fā)送數(shù)據(jù)高位（MSB），我們總會(huì)看見(jiàn)數(shù)據(jù)的停止位。在下面的波特率檢測(cè)程序中，先等待串行通訊輸入管腳的起始信號(hào)（下降沿），然后起動(dòng)定時(shí)器T0。在其后的串行數(shù)據(jù)的每一個(gè)上升沿，將定時(shí)器T0 的數(shù)值捕獲并保存。當(dāng)定時(shí)器T0溢出時(shí)，其最后一次捕獲的數(shù)值即為從串行數(shù)據(jù)起始位到最后一個(gè)上升沿（我們假設(shè)是停止位）過(guò)程所持續(xù)的時(shí)間。
標(biāo)簽： 80C51 自動(dòng)檢測(cè) 串行通訊 波特率
上傳時(shí)間： 2014-08-22
上傳用戶：dajin
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.
標(biāo)簽： Assembly Language C6000 320C
上傳時(shí)間： 2013-11-12
上傳用戶：chens000
The PAM2862 is a continuous mode inductivestep-down converter, designed for driving singleor multiple series connected LEDs efficientlyfrom a voltage source higher than the LEDvoltage. The device operates from an inputupply between 6V and 30V and provides anexternally adjustable output current of up to 1A.Depending upon supply voltage and externalcomponents, this can provide up to 24 watts ofoutput power.
標(biāo)簽： Driver 2862 with PAM
上傳時(shí)間： 2013-11-16
上傳用戶：司令部正軍級(jí)
The PCA9540B is a 1-of-2 bidirectional translating multiplexer, controlled via the I2C-bus.The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels.Only one SCx/SDx channel is selected at a time, determined by the contents of theprogrammable control register.
標(biāo)簽： 2channel 9540B 9540 mult
上傳時(shí)間： 2014-12-28
上傳用戶：nshark
The PCA9541 is a 2-to-1 I2C-bus master selector designed for high reliability dual masterI2C-bus applications where system operation is required, even when one master fails orthe controller card is removed for maintenance. The two masters (for example, primaryand back-up) are located on separate I2C-buses that connect to the same downstreamI2C-bus slave devices. I2C-bus commands are sent by either I2C-bus master and are usedto select one master at a time. Either master at any time can gain control of the slavedevices if the other master is disabled or removed from the system. The failed master isisolated from the system and will not affect communication between the on-line masterand the slave devices on the downstream I2C-bus.
標(biāo)簽： master C-bus 9541 PCA
上傳時(shí)間： 2013-10-09
上傳用戶：3294322651
The PCA9542A is a 1-of-2 bidirectional translating multiplexer, controlled via the I2C-bus.The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels.Only one SCx/SDx channel is selected at a time, determined by the contents of theprogrammable control register. Two interrupt inputs, INT0 and INT1, one for each of theSCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as anAND of the two interrupt inputs, is provided.
標(biāo)簽： 2channel 9542A 9542 mult
上傳時(shí)間： 2013-12-07
上傳用戶：europa_lin
The PCA9670 provides general purpose remote I/O expansion for most microcontrollerfamilies via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plusfamily.The PCA9670 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus(Fm+) I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, higher total package sink capacity(200 mA versus 100 mA) that supports having all 25 mA LEDs on at the same time andmore device addresses (64 versus 8) are available to allow many more devices on the buswithout address conflicts.
標(biāo)簽： Remote expand 9670 PCA
上傳時(shí)間： 2013-10-15
上傳用戶：stella2015
The PCA9547 is an octal bidirectional translating multiplexer controlled by the I2C-bus.The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Only oneSCx/SDx channel can be selected at a time, determined by the contents of theprogrammable control register. The device powers up with Channel 0 connected, allowingimmediate communication between the master and downstream devices on that channel.
標(biāo)簽： channel 9547 mult PCA
上傳時(shí)間： 2014-12-28
上傳用戶：270189020
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