The communication model between the ips and the multiple sub-mcus based on rs485 bus, and the design of r & w controllers, was expatiated 摘要首先介绍了系统总体控制方案的选取,采用基于rs485总线的工控机和多下位机通讯方式,及上钩区和脱钧区读写控制器的设计。
Microcontrollers mcus and digital signal processors dsps are here to stay, and are becoming more pervasive in industrial, communications, automobile, and consumer products 微控制器mcu和数字信号处理器dsp在工业通信汽车和消费类产品中得到越广泛的应用
Or it can operate in a passive, listen-only " bridge " mode between two video conferencing terminals to troubleshoot problems between terminals or mcus from different manufacturers 或者它也能够在两个视频会议终端之间以被动的仅聆听的“桥”模式运行,排斥不同厂商的终端或
However, the mcus of tax-controlled cash registers mainly sailed on today ’ s market are most 8 or 16-bit mcus, and their functions can not meet the needs of consumers any more 而目前市场上的税控收款机是以8位或者16位单片机为主,现有的功能已经越来越不能满足客户的需求。
However, the mcus of tax-controlled cash registers mainly sailed on today ’ s market are most 8 or 16-bit mcus, and their functions can not meet the needs of consumers any more 而目前市场上的税控收款机是以8位或者16位单片机为主,现有的功能已经越来越不能满足客户的需求。
At present, the widly used tcp / ip stacks for embedded systems are uip and lwip, both of which are written in c language, easy to transplant and suitable for 8 / 16 bit mcus . in this paper, we focus on the transplant and applications of embedded tcp / ip technology 目前,应用比较广泛的嵌入式tcp/ip协议栈有uip和lwip。它们是精简的协议栈,用c语言编写,因此可移植性好,适用于8/16位单片机。
While the mcus of fiscal cash register available on today ’ s market are mainly 8 or 16-bit and don ’ t possess operating system, which result in the simple function, poor memory property and inconvenient manipulation etc . the aim of this project is the design of a novel kind of fiscal cash register based on 32-bit arca2 cpu microprocessor of embedded system which match up to the national standard of tax revenue 但是,现在市场上的主流税控收款机的处理器芯片多采用是8位或16位单片机,并且不采用操作系统,因此它的功能简单、存储能力弱,操作不方便等缺点。针对此现状,我们设计和开发了一种基于32位arca2cpu微处理器的嵌入式系统的税控收款机,以满足目前市场的需要。
With the extending and development of mcus " applications in fields of industrial control, electronic equipments, military meters, information applications and many kinds of intellective equipments, the typical 8-bit mcu represented by mcs-51 emerges some limitations, such as low frequency and low working efficiency . to overcome these handicaps, a new type of 8-bit mcu core suitable for embedded applications has been introduced in this thesis 随着工业控制、仪器仪表、军工电子、信息电器和各种智能化设备中微控制器应用的扩展与深化,以mcs-51为代表的传统八位微控制器显示出一定的局限性,如频率低、处理效率不高、外部配置不灵活等。
This paper will introduce mcu chip, spi, data sampling and its algorithms digital output circuit in main board and anti-jamming method in the device . mcu is the core of protection devices, mcus in both managing and main boards are both mc9s12dg256 chips . the applying of spi improves the reliability, simplifies the circuit and expands the external devices mcu是整个新型数字保护的核心,本装置的主板和管理板上的mcu都选用motorola公司的mc9s12dg256,其中spi串行扩展总线的使用,使得装置的开入、开出和ad芯片与mcu接口简单,大大提高了装置的可靠性,在本装置中起着举足轻重的作用,本文对256微处理器介绍后,将对其内部spi串行扩展总线单独介绍。