常量：常量是在程序执行过程中其值不能改变的量。常量的数据类型有整、浮点型、字符型和字符串型等，C51编译器还扩充了一种位（BIT）标量。
上传时间： 2013-11-06
上传用户：lwq11
描述 P89C660/662/664/668单片机内带6KB/32KB/64KB/64KBFlash存储器,该存储器既可并行编程也可以串行在系统编程(ISP).在实际的成型产品中,可通过ISP升级用户程序在BootROM程序. 在Boot ROM程序中,可通过一个默认的串行下载器(UART)对Flash存储器作ISP编程,而在Flash代码区中并不需要有调用下载器的代码,用户程序可通过调用在Boot ROM中的标准子程对Flash存储器擦写和再编程(即IAP).
上传时间： 2013-10-18
上传用户：ouyang426
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 under-bit microcontrollers from the main component of the tour distributed temperature detection system is presented. Master and slave can use RS-485 serial communication standards for communications.Based on next-bit machine for basic goods temperature detected data Tour, the top can achieve the integrated treatment of PC functions or for the expansion of long-distance operation. The entire inspection system is fast, expansion.
上传时间： 2013-10-13
上传用户：zhoujunzhen
Mega16是一款采用先进RISC精简指令，内置A/D的8位单片机，可支持低电压联机 Flash和EEPROM 写入功能；同时还支持 Basic和C 等高级语言编程。用它设计电子时钟不仅成本低，硬件简单，而且很容易实现系统移植。介绍了如何利用AVR系列单片机Mega16及1602字符液晶来设计电子时钟的方法，同时给出了相应的电路原理及部分语言程序。 Abstract: ?Mega16 is a high-performance, low power consumption, the use of advanced RISC concise instructions, built-in A/D 8-bit microcontrollers, the on-line support for low-voltage Flash, EEPROM write function. Except Mega16 also support the Basic, C, and other high-level language programming.The electronic clock which is deisgned by Mega16 is not only low-cost, simple hardware, but easy to achieve system migration.The design method of electrioic clock based on the AVR Mega16 and character LCD1602 is introduced in this paper,and the corresponding circuit electrionic and some language program are given.
上传时间： 2014-12-27
上传用户：zl5712176
针对51单片机系统中常用的A/D转换器价格高、精度低的缺点，介绍TI公司的16 位的带有I2C串行接口的A/D转换器ADS1110的工作原理，给出ADS1110与AT89C51单片机系统的接口电路和软件设计。实践证明，ADS1110具有高性价比和实用性。 Abstract: According to the disadvantages of high expense and low accuracy of the general A/D converter used in MCS51 microchip system,the principle and working process of a high accuracy 16-bit A/D conversion ADS1110 which has I2C bus and belongs to TI Company are proposed here as well as the interface of ADS1110 to AT89C51 and software list.It is proved to be high performance index and practicability.
上传时间： 2013-11-21
上传用户：gyq
基于CC1110单片机公交报站系统主要由CC1110单片机最小系统和WT588D语音模块组成，提出了如何实现语音报站，通过无线通信SimpliciTI网络协议实现公交站台的自动播报和OLCD液晶显示公交运行的各类信息。结果表明，该公交报站系统报站准确率99%，价格比同类产品下降了300%以上，系统组成结构简单，提高了系统的抗干扰性和稳定性，也便于携带。 Abstract: The bus stop announcement system based on CC1110 MCU is composed of CC1110 MCU minimum system and WT588D voice module. How to achieve the voice announcing is put forward.The bus-stop will announce automatically and display on the OLCD by means of wireless communication SimpliciTI network protocol. As a result， the bus station stop announcement systems reported 99% accuracy rate， price of similar products declined by 300% or more， system of simple structure， improve the anti-jamming and stability of the power system， it is also portable.
上传时间： 2013-10-21
上传用户：baby25825
1 FEATURES· Single chip LCD controller/driver· 1 or 2-line display of up to 24 characters per line, or2 or 4 lines of up to 12 characters per line· 5 ′ 7 character format plus cursor; 5 ′ 8 for kana(Japanese syllabary) and user defined symbols· On-chip:– generation of LCD supply voltage (external supplyalso possible)– generation of intermediate LCD bias voltages– oscillator requires no external components (externalclock also possible)· Display data RAM: 80 characters· Character generator ROM: 240 characters· Character generator RAM: 16 characters· 4 or 8-bit parallel bus or 2-wire I2C-bus interface· CMOS/TTL compatible· 32 row, 60 column outputs· MUX rates 1 : 32 and 1 : 16· Uses common 11 code instruction set· Logic supply voltage range, VDD - VSS: 2.5 to 6 V· Display supply voltage range, VDD - VLCD: 3.5 to 9 V· Low power consumption· I2C-bus address: 011101 SA0.
上传时间： 2013-11-08
上传用户：laozhanshi111
为了在工业生产及过程控制中准确测量温度，设计了一种基于低功耗MSP430单片机的数字温度计。整个系统通过单片机MSP430F1121A控制DS18B20读取温度，采用数码管显示，温度传感器DS18B20与单片机之间通过串口进行数据传输。MSP430系列单片机具有超低功耗，且外围的整合性高，DS18B20只需一个端口即可实现数据通信，连接方便。通过多次实验证明，该系统的测试结果与实际环境温度一致，除了具有接口电路简单、测量精度高、误差小、可靠性高等特点外，其低成本、低功耗的特点使其拥有更广阔的应用前景。 Abstract: In order to obtain accurate measuring temperature in industrial production and process control， a digital thermometer based on MSP430 MCU is designed. The system uses MSP430F1121A MCU to control DS18B20， and gets the temperature data， which is displayed on the LED. The temperature sensor DS18B20 and MCU transmit data through serial communication. MSP430 series has ultra-low power and high integration， DS18B20 only needs one port to achieve data communication. Through many experimental results prove， this system is consistent with actual environment temperature. The system has characteristics of interface circuit simple， high measuring accuracy， minor error， high reliability， besides， the characteristics of low cost and low power make it having vaster application prospect.
上传时间： 2013-10-16
上传用户：wettetw
描述P89C660/662/664/668单片机内带6KB/32KB/64KB/64KB Flash存储器,该存储器既可并行编程也可以串行在系统编程(ISP).在实际的成型产品中,可通过ISP升级用户程序. 在Boot ROM程序中可通过一个默认的串行下载器(UART)对Flash存储器作ISP编程,而在Flash代码区中并不需要有调用下载器的代码,用户程序可通过调用在Boot ROM中的标准子程对Flash存储器擦写和再编程(即IAP). 该器件在6个时钟周期内执行一条指令,是传统的80C51的两倍.一个OTP结构位让用户选择传统的12个时钟周期. 该器件用advanced CMOS工艺制造,是80C51单片机家族的衍生品.其指令集和80C51相同. 该器件有四个8位I/O口,三个16位定时器/事件计数器,多中断源,四个优选级,可嵌套中断结构,一个增强型UART和片内振荡器以及时序电路. P89C660/662/664/668新增特性使其成为一个功能强大的单片机,为某些应用提供PWM,高速的I/O和加/减计数,如汽车控制.
上传时间： 2013-10-10
上传用户：FreeSky
摘要：讨论了MCS一51单片机汇编语言中的伪指令，并介绍若干主要的经常用到的伪指令使用方法。关键词：单片机；伪指令；ORG；EQU；DB；DW；BIT
上传时间： 2013-12-21
上传用户：283155731
