One of the fi rst lessons in a basic electronics coursecovers the symbols for resistors, capacitors, inductors,voltage sources and current sources. Althougheach symbol represents a functional component of areal-world circuit, only some of the symbols have directphysical counterparts. For instance, the three discretepassive devices—resistors, capacitors, inductors—canbe picked off a shelf and placed on a real board muchas their symbolic analogs appear in a basic schematic.Likewise, while voltage sources have no direct 2-terminalanalog, a voltage source can be easily built with an offthe-shelf linear regulator.
上传时间： 2013-11-24
上传用户：simonpeng
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
标签： C8051F020
上传时间： 2013-10-12
上传用户：lalalal
针对科研实验中对拉压千斤顶加载过程控制的需要，采用ATmega128单片机控制步进电机进而实现对执行系统的电动泵站实行自动控制。对力和位移的数据采集与处理及用步进电机控制电动泵站手柄的技术细节作了重点描述。通过单片机的A/D变换器对AMP放大模块采集的电桥信号作量化处理，千斤顶的操控手柄位置依电动油泵阀门开启的方向和大小作若干定位，单片机根据力或位移传感器信号，实时控制步进电机驱动手柄旋转到相应操控位置。 Abstract: This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing， and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge， jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals， real-time control stepper motor drive control handle rotate to the appropriate location.
上传时间： 2014-01-16
上传用户：hasan2015
为了提高传统温度控制系统的性能，将PID控制理论与嵌入式系统相结合，采用瑞萨电子公司的H8S/2166作为核心处理器，AD公司的AD7705以及热敏电阻温度传感器作为温度检测单元，利用4×6小键盘、LCD显示器和S1D13305液晶控制器达到良好的人机交互，设计出了一个应用于化工领域的嵌入式实时温度控制系统。相比于传统温度控制系统，该系统提供了更强的计算能力和可扩展能力，采用增量PID控制算法实现复杂控制。通过实验，该系统能达到0.1 ℃的温度控制精度以及小于120 s的温度稳定时间。 Abstract: In order to improve the performance of conventional temperature control system， combining PID control theory with embedded systems， using the Renesas Electronics Corp. H8S/2166 micro-controller as a core processors， AD7705 and thermistor temperature sensor as a temperature detection unit and 4×6 small keyboard， LCD and S1D13305 LCD controller as a good human-computer interaction， this paper designed an embedded real-time temperature control system which is applied in chemical industry. Compared with conventional temperature control system， this system provides more computing power and extensibility， and adopts PID control algorithm for complex control. Through the experiment， the system can reach temperature control accuracy of 0.1 ℃ and temperature stabilization time of less than 120 seconds.
上传时间： 2014-12-26
上传用户：003030
目录： 1. Character Type Functions － 字符类型函数 2. Standard C Input/Output Functions － 标准输入输出函数 3. Standard Library Functions － 标准库和内存分配函数 4. Mathematical Functions － 数学函数 5. String Functions － 字符串函数 6. BCD Conversion Functions － BCD 转换函数 7. Memory Access Functions － 存储器访问函数 8. Delay Functions － 延时函数 9. LCD Functions － LCD函数 10. LCD Functions for displays with 4x40 characters － 4×40 字符型LCD函数 11. LCD Functions for displays connected in 8 bit memory mapped mode －以8 位外部存储 器模式接口的LCD显示函数 12. I2C Bus Functions － I2C 总线函数 13. National Semiconductor LM75 Temperature Sensor Functions － LM75 温度传感器函数 14. Dallas Semiconductor DS1621 Thermometer/Thermostat Functions － DS1621 温度计函 数 15. Philips PCF8563 Real Time Clock Functions － PCF8563 实时时钟函数 16. Philips PCF8583 Real Time Clock Functions － PCF8583 实时时钟函数 17. Dallas Semiconductor DS1302 Real Time Clock Functions － DS1302 实时时钟函数 18. Dallas Semiconductor DS1307 Real Time Clock Functions － DS1307 实时时钟函数 19. 1 Wire Protocol Functions － 单线通讯协议函数 20. Dallas Semiconductor DS1820/DS1822 Temperature Sensors Functions － DS1820/1822 温度传感器函数 21. SPI Functions － SPI 函数 22. Power Management Functions － 电源管理函数 23. Gray Code Conversion Functions － 格雷码转换函数
上传时间： 2013-10-22
上传用户：归海惜雪
首先研究CAN总线和SAE J1939协议，提出一种基于MC9S12HZ256微控制器的总线式汽车数字仪表解决方案。详细介绍SAE J1939协议的报文帧格式及应用层协议中发动机相关参数的定义，以及步进电机及其驱动和车速信号的处理方法。该数字仪表系统硬件平台由微处理器和信号采集和信息处理及显示等模块组成。软件设计部分编程实现了对CAN总线和各传感器数据的读取、处理。该系统能够实时反映车辆工况。 Abstract: In this paper，CAN bus and SAE J1939protocol are researched，and a vehicle digital instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver，the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital instrument is composed by MCU，signal acquisition mod-ule，and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming，and vehicle condition can be reflected in real-time.
上传时间： 2013-10-20
上传用户：huannan88
实时时钟是微机保护装置的重要部件，在讨论PCF8583结构与功能的基础上，提出采用dsPIC33F系列微处理器与串行I2C时钟PCF8583的接口设计方案，给出了相应的接口电路与软件流程。该设计方案结构简单，可靠性高，开发周期短，具有一定的实用与参考价值。所设计的微机保护装置已投入现场运行，效果良好。 Abstract: Real-time clock chip is an important part in microcomputer protection device.Based on discussing the structure and function of PCF8583，a new interface scheme which uses dsPIC33F microprocessor and serial clock chip（I2C）PCF8583is proposed.The method of the circuit design and the main software flow are introduced in this paper.The scheme has simple structure，higher reliability and shorter exploitation cycle，so has definite practicality or reference value.The microcomputer protection device has been put into operation with better effects.
上传时间： 2013-11-18
上传用户：Thuan
介绍一种基于C8051单片机的动态心电监护系统。该系统由两部分组成：以C8051F320单片机为核心的数据采集装置和以PC机为平台的分析处理系统。硬件电路功耗低，由单片机自带的USB接口将数据传送给PC机。软件平台采用LabVIEW可视化虚拟仪器系统开发平台，将传统仪器的功能模块集成到计算机中，用户可通过修改虚拟仪器的程序改变其功能。采用USB接口实时传输心电数据，并将数据采集模块设计为计算机外设，使该系统高速快捷、小巧便携。 Abstract: In this design，a low-cost ECG electrocardiogram monitoring system is introduced，which consists of two parts:data acquisition device based on C8051F320and PC terminal as the analysis and processing system.The system is low-power consumption，the data is transmitted to the PC terminal by USB interface of the C8051F320.By using the visible virtual instrument system developing platform LabVIEW，the traditional instruments function modules are integrated into the computer，so the user can modify virtual instrument software to change its function to meet their needs.Using USB in-terface to realize real-time ECG data transmission，in addition，ECG data acquisition module is designed as the computer peripheral，which makes the syetem high-speed and portable.
上传时间： 2013-11-13
上传用户：zhangzhenyu
针对盘山路存在的转弯盲区，即在转弯时司机无法得知弯路对面是否有车辆通过，设计一种基于C8051F310的山路转弯预防警示系统。该系统利用一阶滤波算法检测山路转弯时是否有车辆通过。运用该算法可增强系统检测的实时性，提高检测机动车辆的灵敏度，同时大大减少环境温度对检测的干扰。试验表明该系统能够正确指示出在山路转弯时是否有车辆通过，目前该系统已安装在盘山路上，可大大减少事故的发生率。 Abstract: Aiming at passing hilly road，there is a turn blind spot.Motormen usually do not know if the passing of vehicles pass the road.So a system of defending accident on hilly road is designed,which is based on MCU C8051F310.The sys-tem uses the first-order filter algorithm to detect whether there are passing vehicles.This algorithm enhances the real-time detection and improves the sensitivity of detection vehicles.Meanwhile,it reduces the detection interference of environmen-tal temperature.The experimental results show that this system can exactly indicate if there are passing vehicles.At present,the system has been successfully applied to hilly road.The system can greatly decrease accident.
上传时间： 2013-10-10
上传用户：归海惜雪
该系统由单片机89S52控制模块，程控宽带放大模块，整形模块，FPGA内频率、相位差测量模块等构成，采用等精度测频法测出频率和周期，可测量有效值为0.01～5V，频率范围1Hz～20MHz信号的频率、周期信号，精度高达10-6。采用计数法测量相位差，该系统可测量有效值0.5～5V，频率10Hz～100kHz信号的相位差，精度为1°。系统功能由按键控制，测量结果实时显示，人机界面友好。 Abstract: The system consists of the following functional blocks:89S52microcontroller controlling module,programmable amplifier module,comparator module,frequency and phase difference testing module in the FPGA.The system use the equal accuracy frequency-examining technique it measures frequency and circle of signal which its ranges is from1Hz to20MHz and the amplitude of which its range is from0.01Vrms to5Vrms,precision is up to10-6.Using of count method,the system detects the phase difference of signal,the amplitude of whic its range is from0.5Vrms to5Vrms and the frequency of which its ranges is from10Hz to100kHz,precision is up to1°,The system functions is controlled by certain keys,measurement results are displayed in real-time and it is friendly interface.
上传时间： 2013-11-04
上传用户：CHINA526
