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protel123
- 原理图常见错误: (1)ERC报告管脚没有接入信号: a. 创建封装时给管脚定义了I/O属性; b.创建元件或放置元件时修改了不一致的grid属性,管脚与线没有连上; c. 创建元件时pin方向反向,必须非pin name端连线。 (2)元件跑到图纸界外:没有在元件库图表纸中心创建元件。 (3)创建的工程文件网络表只能部分调入pcb:生成netlist时没有选择为global。 (4)当使用自己创建的多部分组成的元件时,千万不要使用annotate.-principle of common mi
mcs51_MP3
- 1)MCS51内核,可以利用单片及开发软件Keil软件方便开发mp3播放器,无需特殊软件平台; 2)MPEG I/II-Layer 3 hardware decoder .独立MP3 Decoder .支持48,44.1,32,24,22.05,16khz取样频率 .支持软件31阶音量控制,高中低音均衡控制 .重低音效果 3)集成DAC部件,支持PCM,IIS格式; 4)64K字节片上代码存储空间(100K次擦写寿命) 5)4K字节boot f
zzxc45
- 采用ASP+ACCESS+ASPUPJPG组件构成,自动生成缩图,具有专题组管理功能,可以按照片分类(风景,人物,等),同时也可以按专题组分类-ASP ACCESS ASPUPJPG constitute components, automatic thumbnail generation, with cluster management functions, we can follow the film classification (landscapes, figures, etc.), b
assignmentP2
- 1. Access the relevant reference books or technical data books and give accurate definitions for the following timing parameters: (1) propagation time tPD, (2) transition time tTD, (3) setup time tSU, (4) hold time tHD, and (5) clock-to
arm_architecture
- ARM Architecture Reference Manual The purpose of this manual is to describe the ARM instruction set architecture, including its high code density Thumb® subset, and three of its standard coprocessor extensions: • The standard System
counter
- -- Mod-16 Counter using JK Flip-flops -- Structural descr iption of a 4-bit binary counter. -- The first two design entities describe a JK flip-flop and a 2-input AND gate respectively. -- These are then packaged together along with a signal
64-Calculator
- 算器一般由运算器、控制器、存储器、键盘、显示器、电源和一些可选外围设备组成。低档计算器的运算器、控制器由数字逻辑电路实现简单的串行运算,其随机存储器只有一、二个单元,供累加存储用。高档计算器由微处理器和只读存储器实现各种复杂的运算程序,有较多的随机存储单元以存放输入程序和数据。 -Solvers generally computing, controller, memory, keyboard, monitor, power, and some optional peripheral equ
59-Trafic-Lamp
- 本系统由单片机系统、键盘、发光二极管、交通灯演示系统组成,单片机作为主控制器用于十字路口的车辆及行人的交通管理,每个方向具有左拐、右拐、直行及行人4种通行指示灯,计时牌显示路口通行转换剩余时间。另外,在特种车辆如119、120通过路口时,系统可自动转为特种车辆放行,其他车辆禁止通行的状态,15s后系统自动恢复正常管理。并有手动控制分时段 84s与60s通行管理转换等功能。 -The system consists of microcontroller system, keypad, LED,
DS12887
- The DS12887 Real Time Clock plus RAM is designed to be a direct replacement for the DS1287. The DS12887 is identical in form, fit, and function to the DS1287, and has an additional 64 bytes of general purpose RAM. Access to this additional RAM sp
Radio-over-Fibre-Technology
- Radio-over-Fibre Technology for Broadband Wireless Communication Systems -The research in this thesis focussed on the feasibility of using both single-mode and multimode fibres to distribute high-frequency microwave signals to simplified remote
Protel99package
- Protel99 常用元件封装,方便新手查阅,可当字典用-Protel99 common components package, novice easy access, can be used as a dictionary