中断程序的编写：在单片机系统的p1口上接有8个LED，LED的阳极接+5V，阴极接P1口的引脚。当P1口某一口线输出为0时，将LED点亮。在外部中断0输出引脚P3.2引脚上接上上拉电阻并接有一个按钮开关K1。用K1按钮来产生外部中断0的输入信号。定时器程序的编写：在AT89S51单片机的P1口上接有8个LED.下面采用定时器T0的方式一的定时中断方式，使P1口外接的8个LED每0.5秒闪亮一次。C51程序：在AT89S51的P1.0脚接有一只发光二极管，二极管的阴极接P1.0脚，阳极通过限流电阻接+5V，现在让发光二极管每隔800毫秒闪灭，占空比为50 。不使用函数strcat（），用字符指针变量作函数参数编程实现字符串连接函数strcat()的功能，将字符串srcStr连接到字符串dstSTR的尾部。用基本文件操作编写DOS下的TYPE命令，即把文件内容以ASCII码字符方式向标准输出设备输出。
Write interrupt routine: on the SCM system p1 port connected with 8 LED, LED anode connected to+ 5V, the cathode connected to the P1 port pins. When a certain line P1 port output is 0, the LED lights. In the pull-up resistor connected to the external interrupt and then there is a button to switch on the K1 0 output pin P3.2 pin. With K1 button to generate an external interrupt 0 input signal. Write timer programs: On AT89S51 microcontroller P1 port is connected with 8 LED timer below using the timer T0 interrupt the way a way to make the P1 port 8 LED external flash once every 0.5 seconds. C51 Procedure: AT89S51 of P1.0 pin is connected with a light emitting diode is connected to P1.0 cathode and the anode through the current limiting resistor connected to+ 5V, now let the light emitting diode flash off every 800 ms, the duty cycle is 50 . Do not use the function strcat (), with the character pointer variable as a function parameter programming string concatenation function strcat () (2016-04-12, WORD, 11KB, 下载3次)
许多应用都要求通过高分辨率、差分输入ADC来转换单端模拟信号，无论是双极性还是单极性信号。本直流耦合电路可将单端输入信号转换为差分信号，适合驱动PulSAR系列ADC中的18位、1 MSPS器件AD7982。该电路采用单端转差分驱动器ADA4941-1 和超低噪声5.0 V基准电压源ADR435 ，可以接受许多类型的单端输入信号，包括高压至低压范围内的双极性或单极性信号。整个电路均保持直接耦合。如果需要重点考虑电路板空间，可以采用小封装产品，图1所示的所有IC均可提供3 mm × 3 mm LFCSP或3 mm × 5 mm MSOP小型封装。
Many applications require high resolution, the differential input ADC to convert single-ended analog signals, both bipolar and unipolar signal. The dc coupled circuit single-ended input signal can be converted into difference signal, suitable for drive PulSAR series of ADC (2015-09-10, WORD, 37KB, 下载3次)
本文介绍了一种采用数字电路制作的多功能数显抢答器，它主要采用了74系列的常用集成电路，它除了具有基本的抢答功能之外，还具有定时报警的功能，和数显的功能，当抢答开始后，系统会自动倒计时，并且时间是可以预设的，期间有人抢答的话系统会停止计时，如果期间没人抢答，系统会有短暂的报警，提示抢答结束。关键字：单片机、PLC、抢答、报警、数显
This paper presents a digital circuit produced using digital multifunction Responder, which mainly uses a series of 74 commonly used integrated circuits, in addition to its basic function of answer, but also has the function of timed alarms, digital display functions When the answer in the beginning, the system will automatically count down, and the time can be preset, someone answer period, then the system will stop timing, if nobody answer period, the alarm system will be brief, suggesting that the end of the answer. Keywords: microcontroller, PLC, answer, alarm, digital (2014-05-02, WORD, 158KB, 下载4次)
本文在嵌入式技术的基础上进行微孔振动钻削机床数控系统硬件平台和软件平台的开发。系统的硬件结构以高性能低功耗的32位ARM7嵌入式处理器LPC2210为控制核心，配以必要的外围模块；软件系统以源码开发的嵌入式实时操作系统μC/OSⅡ为核心，开发了设备运行管理所需的应用控制软件。该数控系统不仅可靠性高、功能性强、稳定性好，而且具有良好的可移植性和可裁剪性，可根据实际的需求进行功能的扩展和裁剪。
In this paper, based on embedded technology micro-vibration drilling machine CNC system hardware platforms and software platform development. System' s hardware architecture to high-performance low-power 32-bit ARM7 embedded processor LPC2210 for the control of the core, accompanied by the necessary peripheral modules software systems in order to source the development of embedded real-time operating system μC/OS Ⅱ core, the development of equipment operation and management of the required application control software. The CNC system is high reliability, functionality, strong, good stability, but also has good portability and scalability, according to the actual needs of functional expansion and cutting. (2010-03-22, WORD, 143KB, 下载21次)
一、设计要求：1• 截止频率fH3d=1kHz
2• 带外衰减速率小于-30dB/10倍频
二、总体方案讨论：二阶RC有源滤波器的功能是让一定的频率范围内的信号通过，抑制或急剧衰减此范围内的信号，常用电路有电压控制电压源(VCVS)电路和无限增益多路反馈(MFB)电路，本设计采用电压控制(VCVS)电路，其中运放是通向输入，输入阻抗很高，输入阻抗很低，其优点是电路性能稳定，增益容易调节
First, the design requirements: 1 • cutoff frequency fH3d = 1kHz
2 • -of-band octave attenuation rate of less than-30dB/10
Second, the overall program discussion: Second-order RC active filter function is so that a certain frequency range of signals, inhibit or rapid attenuation of signal within this range, common circuit voltage-controlled voltage source (VCVS) circuit and an infinite gain Multiple feedback (MFB) circuit, this design uses a voltage-controlled (VCVS) circuit, which op amp is the path input, input impedance, high input impedance is very low, its advantage is that the circuit performance is stable, easy to adjust the gain
(2010-01-19, WORD, 885KB, 下载23次)
箱式变电站又称户外成套变电站，也有称做组合式变电站，它是发展于20世纪60年代至70年代欧美等西方发达国家推出的一种户外成套变电所的新型变电设备，由于它具有组合灵活，便于运输、迁移、安装方便，施工周期短、运行费用低、无污染、免维护等优点，受到世界各国电力工作者的重视。进入20世纪90年代中期，国内开始出现简易箱式变电站，并得到了迅速发展。
本课题的主要内容包括箱式变电站的发展应用，箱式变电站的结构分类，以及箱式变电站一次系统设计极其设备选型，二次系统设计，以及箱式变电站的智能监控系统。35kV箱式变电站的设计高压侧额定电压为35kV，低压侧额定电压为10kV，主变压器容量为5000kVA。主接线采用单母线分段接线。
Box-type transformer substation calls again outdoor a transformer substation, also call to do the sectional transformer substation. It is a development to wait to 70 s Europe and America western prosper in the 60 s of 20 centuries the nation release a kind of outdoor the set changes to give or get an electric shock of new change to give or get an electric shock the equipments, because it have the combination vivid, easy to conveyance, move, install convenience, start construction construction the period is short and circulate the expenses low, free from pollution, do not need maintenance etc. advantage, suffer the international community electric power the worker values.Enter the middle of 90 s of 20 centuries. The domestic starts appearing the simple box-type transformer substation , and got the quick development.
The article regard box-type transformer substation as a development for relating box-type transformer substation applied, the construction of box-type transformer subst (2009-05-24, WORD, 70KB, 下载21次)
实验四 子程序设计实验
实验目的：通过调试数据块传送程序，加深对循环程序的理解，掌握子程序的设计与MedWin环境下子程序的调试。进一步加深对并行I/O口的理解。
实验内容：
1. 调试程序dmove.asm，观察片外数据区7000H、A000H开始的单元内容变化规律。
修改程序将7010H－7073H单元内容传送至B000H开始的存储区中。
2. 设计一个子程序，统计片外数据区从2000H开始的256个符号数中偶数的个数，低位存入R3，高位存入R2。
3.(选作题)设计子程序，实现对片外数据存储器的测试。具体要求如下：
1）测试方法自选
2）数据存储区首地址、长度可变。
3）可统计坏单元数目，并记录坏单元地址。
4）利用LED指示灯，提示测试过程和结果状态。
思考题：
1.从2000H单元开始的外部RAM中存有100个数，要求把它传送到自2500H单元开始的存贮区中去，但在传递过程中要检查数的值，遇到第一个零就停止传送。应如何编写程序？
2.若要将偶数从小到大排序并置于从2000H开始的前端，其余符号数按原来顺序置于偶数后面。应如何编写程序？
3.若要求偶数的算术平均值，应如何编写程序？
err (2008-12-15, WORD, 27KB, 下载7次)
本系统是通过凌阳的16位单片机SPCE061A测量电阻，电容和电感对应振荡电路
所产生的频率实现对各个参数的测量，一方面测量精度较高，另一方面便于使仪表实现自动化，而且还能加入语音播报的功能使其更加智能化。
其中电阻和电容采用555多谐振荡电路产生的，而电感则是根据电容三点式产生的，SPCE061A的定时器可以利用外部时钟来记数，这里我们将RCL的测量电路产生的频率做为单片机SPCE061A的时钟源，通过记数则可以计算出被测频率，在通过该频率计算出各个参数。
The system through the Sunplus 16-bit single-chip measurement SPCE061A resistors, capacitors and inductors corresponding oscillation frequency generated by circuit realize the measurement of various parameters, on the one hand, a higher measurement accuracy, on the other hand, so easy to realize automation of instrumentation, and can also join the voice broadcast function to make them more intelligent. Resistors and capacitors in which the use of more than 555 have a harmonic oscillator circuit, and the inductance is based on three-point capacitance generated, SPCE061A timer external clock can be used to remember a few, here we will have a RCL circuit measurement frequency as Singlechip SPCE061A clock source, through the notation can be measured to calculate the frequency of the frequency of the adoption of the various parameters calculated. (2008-05-24, WORD, 949KB, 下载61次)
AD高精度采集校正设计
提出了一种高精度数模转换软件校正算法,用以消除运放放大器、比例电阻、AD转换器、印制电路板等物理上带来的误差，我们已成功应用于数字电压表、数字电流表、数字欧姆表、数字程控电源等项目上，实践证明该算法应用于各种AD高精度转换的校正,消除物理上带来的误差
AD-tuning the design of high-precision capture of a high-precision digital-to-analog conversion software correction algorithm to eliminate OPAMP amplifier, the ratio of resistors, AD converters, printed circuit board, such as the error caused by physical, we have successfully applied digital voltage meter, digital ammeter, digital ohmmeter, digital program-controlled power supply and other projects, the practice proved that the algorithm is applied to a variety of high-accuracy AD conversion of the correction, to eliminate the error caused by physical (2008-05-21, WORD, 30KB, 下载331次)
中南大学数字电子技术课程设计--数字钟的设计
一.设计目的
1. 进一步掌握各芯片的逻辑功能及使用方法。
2. 进一步掌握数字钟的设计方法和和计数器相互级联的方法。
3. 进一步掌握数字系统的设计和数字系统功能的测试方法。
4. 进一步掌握数字系统的制作和布线方法。
二.设计要求
1．设计指标
数字钟具有显示时、分、秒的功能；
有校时功能，可以分别对时及分进行单独校时，使其校正到标准时间；
计时过程具有报时功能，当时间到达整点前10秒进行蜂鸣报时，报时声音四低一高；
并且要求走时准确。
2．设计要求
画出电路原理图（或仿真电路图）；
元器件及参数选择，有相关原器件清单；
3．制作要求 自行装配和调试，并能发现问题和解决问题。
4．编写设计报告 写出设计与制作的全过程，附上有关资料和图纸，有心得体会。
err (2008-01-17, WORD, 156KB, 下载120次)
课题的提出及意义
单片机作息时间控制实现了对时间控制的智能化，摆脱了传统由人来控制时间的长短的不便，实现代学校必不可少的设备。
1. 2 设计的任务及要求
1．作息时间能控制电铃
2．作息时间能启动和关闭放音机
单片机作息时间控制的功能如下：
使用4位七段显示器来显示现在的时间。
显示格式为“时分”
由LED闪动来作秒计数表示
具有4个按键来作功能设置，可以设置现在的时间及显示定时设置时间
一旦时间到则发出一阵声响，同时继电器启动，可以控制放音机开启和关闭。
issues raised and the significance of SCM for them to achieve control of the intelligent control of the time, from the traditional to control people by the length of time, the inconvenience to achieve on behalf of schools essential equipment. 1. 2 design tasks and requirements 1. Work schedules can be controlled bells 2. Work schedules can be activated and the closure of an audio tape recorder MCU control of the daily routine functions as follows : (2007-03-11, WORD, 161KB, 下载407次)
自动控制理论是人类在了解自然和改造自然的过程中逐渐形成的一门学科。简单反馈控制的最早应用，可以追溯到古代亚历山大时期的克泰希比斯水钟，它就是利用反馈原理来调节流量的。19世纪中叶，J.C.麦克斯威尔对具有调速器的蒸汽机（这也利用了反馈原理来调速）系统进行了稳定性的研究。20世纪20年代，布莱克、奈奎斯特和波德在贝尔实验室的一系列研究工作奠定了经典自动控制（反馈）的理论基础------
automatic control theory is the understanding of human nature and the natural process of evolving a disciplines. A simple feedback control of the earliest applications, can be traced back to ancient Alexandria period Ketaixibishi water bell, it is the principle of using feedback to regulate the flow. The mid-19th century, with the right Nan Maxwell governor of the steam engine (which also use a feedback principle to speed) system for the stability of the study. The 1920s, Black, Nyquist and Bode in the Bell Labs research work is a series of classical control (feedback), the theoretical foundation------ (2006-03-11, WORD, 1169KB, 下载13次)