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阐述了一个由上位PC机和AT89C52下位单片机组成的主从分布式温度巡回检测系统。主从机采用RS-485 串行通讯标准进行通信，可在下位单片机实现基本的温度数据巡回检测基础上，由上位PC机实现综合处理功能或扩展为远程操作。整个系统具有巡检速度快，扩展性好的特点。 Abstract:  In this paper,a top PC and AT89C52 u ...

量测/测试所面临之问题 此测试验证上，要使用NI公司之LAB VIEW及DAQ CARD来取代AUDIO PRECISION及其所附软体ATS。首先需克服硬体解析度上的差异，再来是FFT（FAST FOURIER TRANSFORM,快速传立业转换）演算未予的撰写，这将会影响MULTI-TONE讯号上PEAK值的侦测。另外，以RS-232为I/O介面，并呼叫客户所提供之DLL档来与DUT内 ...

针对当前安检力学试验机所能完成的试验种类单一、自动化程度低等问题，提出一种以ATmega128单片机为核心控制器的安检力学试验机的设计。详细阐述了该安检力学试验机各个组成部分的设计原理和方案，并且给出了各部分的软件设计思想和操作流程。经过大量测试试验表明：设计的安检力学试验机可以完成多达十余种的力学安检试验 ...

keil c51 v9.01此版不是汉化中文版，是英文版来的。ARM发布Keil μVision4集成开发环境(IDE)，用来在微控制器和智能卡设备上创建、仿真和调试嵌入式应用。 μVision4 IDE是为增强开发人员的工作效率设计的，有了它可以更快速、更高效地开发和检验程序。通过μVision4 IDE中引入的灵活的窗口管理系统，开发人员可以使用多台 ...

NEC 16位MCU参考手册 The 78K0R/IC3 is a 16-bit single-chip microcontroller that uses a 78K0R CPU core and incorporates peripheral functions, such as ROM/RAM, a multi-function timer, a multi-function serial interface, an A/D converter, a programmable gain amplifier (PGA), a comparator, a real-time cou ...

The PCA9544A provides 4 interrupt inputs, one for each channeland one open drain interrupt output. When an interrupt is generated byany device, it will be detected by the PCA9544A and the interruptoutput will be driven LOW. The channel need not be active fordetection of the interrupt. A bit is also ...

The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallelInput/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed toenhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvementsinclude higher drive capability, 5 V I/O tolerance, lo ...

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 w ...

The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-dra ...

The Philips family of Multiplexers and Switches consists of bi-directional translating switches controlled via the I2C or SMBus to fan out an upstream SCL/SDA pair to 2, 4 or 8 downstream channels of SCx/SDx pairs. The Multiplexers allow only one downstream channel to be selected at a time, while th ...