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Limited-memory

  • LT1300和LT1301在功率DCDC转换器中的应用

      The design of battery-powered equipment can often bequite challenging. Since few ICs can operate directly fromthe end-of-life voltage from a 2-cell battery (about 1.8V),most systems require a DC/DCconverter. The systemdesigner often has a limited area in which to place the DC/DC converter; associated inductors and capacitors must be

    标签: LT 1300 1301 DCDC

    上传时间: 2013-11-23

    上传用户:wys0120

  • NAND_Flash的坏块处理

    产生坏块的原因是因为NAND Flash的工艺不能保证NAND的Memory Array在其生命周期中保持性能的可靠,所以,在NAND的生产中及使用过程中会产生坏块。

    标签: NAND_Flash

    上传时间: 2013-10-24

    上传用户:wojiaohs

  • STM32,5110液晶显示超声波测距探鱼器200KHz,带电路图,精确到厘米

    STM32,5110液晶显示声纳探鱼器200KHz,带电路图,精确到厘米 MC34063升压,大声压发射,实际板子上滤波电路没要(电路图上的滤波电阻电容电感没焊,开路或者短路)。一般200KHz的换能器在水里面的耦合比较好,在空气中发射出来的(或者接收的)强度很低。 用的MOSFET Relay,contact和release时间都可以做到很小,不过选的是比较低端器件,所以最近测量距离为70cm。 开源啦开源啦 架构为状态机+任务流,Task都是放在函数指针数组里面的 Task分两种,routine的和错误处理的 5110液晶的SPI用的DMA 基本上STM32和C语言高阶的特征都用上了,稍微修改直接可以商用 Open Issue 偶尔会hardware fault或者memory fault,然后watchdog重启, 应该比较好解决,仔细检查下就好 有什么问题代码的file comment里面有我联系地址 有能搞到好的器件也请知会我,多谢了 接下来准备把它装到船模上,用以前四轴的那套东西,就看什么时候有时间了

    标签: 5110 STM 200 KHz

    上传时间: 2013-10-28

    上传用户:songyue1991

  • 深入理解SD卡

    SD 卡(Secure Digital Memory Card)是一种为满足安全性、容量、性能和使用环境等各方面的需求而设计的一种新型存储器件,SD 卡允许在两种模式下工作,即SD 模式和SPI 模式,本系统采用SPI 模式。本小节仅简要介绍在SPI 模式下,STM32 处理器如何读写SD 卡,如果读者如希望详细了解SD 卡,可以参考相关资料。

    标签: SD卡

    上传时间: 2013-11-12

    上传用户:huannan88

  • 基于单片机系统的(24,16)循环码编码、译码方案

      在理论分析循环码编码和译码基本原理的基础上,提出了基于单片机系统的(24,16)循环码软件实现编码、译码的方案。仿真结果表明(24,16)循环码能有效地克服来自通讯信道的干扰,保证数据通信的可靠及系统的稳定,使误码率大幅度降低。本论文对(24,16)循环码的研究结果表明,可以有效地降低错误概率和提高系统的吞吐量,实现纠错仅需要在接收端增加有限的存储空间和计算复杂度,具有一定的实用价值。   Abstract:   Based on analyzing the theory of encoding and decoding of cyclic code, this paper showed the schemes of encoding and decoding of(24,16)cyclic code by the software and based on microcontroller. Simulation results show that using (24,16) cyclic codes can effectively overcome the interference from communication channel, ensure the reliability and stability of data communication systems, and reduce the bit error rate greatly. The results of this paper show that by using the (24,16) cyclic code, the error rate can be reduced and the system throughput can be improved. Meanwhile, the system only needs to enlarge limited storage space and computation the complexity at the receiving end to realize error correction. Thus the (24,16) cyclic code has a practical value.  

    标签: 24 16 单片机系统 循环码

    上传时间: 2013-11-09

    上传用户:gaoliangncepu

  • C8051F020

    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

  • AVR常用库函数介绍

    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

    标签: AVR 库函数

    上传时间: 2013-10-22

    上传用户:归海惜雪

  • 单片机Flash存储器坏块自动检测

    在深入了解Flash存储器的基础上,采用单片机自动检测存储器无效块。主要通过读取每一块的第1、第2页内容,判断该块的好坏,并给出具体的实现过程,以及部分关键的电路原理图和C语言程序代码。该设计最终实现单片机自动检测Flash坏块的功能,并通过读取ID号检测Flash的性能,同时该设计能够存储和读取1GB数据。 Abstract:  On the basis of in-depth understanding the Flash chips,this paper designs a new program which using the SCM to detect the invalid block.Mainly through reading the data of the first and second page to detect the invalid block.Specific implementation procedure was given,and the key circuit schematic diagram and C language program code was introduced.This design achieved the function of using the MCU checks the invalid block finally,and increased the function by reading the ID number of Flash to get the performance of the memory.And the design also can write and read1GB data

    标签: Flash 单片机 存储器 自动检测

    上传时间: 2013-10-25

    上传用户:taozhihua1314

  • 基于VHDL的微型打印机控制器设计

    介绍基于VHDL的微型打印机控制器的设计。论述了微型打印机的基本原理,以及实现控制器的VHDL语言设计。打印机的数据来自系统中的存储模块,根据需要控制打印。该微型打印机控制器可取代传统的微型打印机,且抗干扰性好,可靠性高,具有较强的移植性,稍加改动就可应用于不同场合。 Abstract:  This paper introduced the design method of micro printer controller based on VHDL.The basic principles of microprinter is explained,as well as the realization of the controller by VHDL language.The printer data is from the system memory modules,can control printer.The design of microprinter controller has antigood and high reliability,it can replace the traditional printer.The controller has very good portability,and need little modify that can use in different situation.

    标签: VHDL 微型打印机 制器设计

    上传时间: 2013-11-03

    上传用户:dudu1210004

  • 基于单片机AT89C51的MP3播放系统的设计方案

    提出一种基于单片机AT89C51SND1C的MP3播放系统的设计方案。单片机集成了专用的解码器,使用K9F1208闪存作为外存储器,放音电路采用CS4330,存储文件通过播放器上的USB接口设备从PC机上直接下载,液晶显示采用LCD1602。方案设计简单,性价比高,低功耗,易扩展。由于采用的是通用单片机实现的,可以很容易地移植到其他微控制器系统中,有很强的市场竞争能力和实用价值。 Abstract:  A MP3 player design based on microchip AT89C51SND1C was presented, which used K9F1208 Flash chip as the memory circuit and used CS4330 as play chip. Storage files were download from PC through USB interfaces player on the device,and the LCD/602 was used as display screen. This system had characteristics of simple design,low power,easy expand,low cost and high recognition. Using of universual microchip make it easy to transplant to other microcontrol system,and have strong market competitiom and practical value.

    标签: 89C C51 MP3 AT

    上传时间: 2014-12-27

    上传用户:佳期如梦