PLCC-44 封装尺寸图P-44A
上传时间： 2013-11-13
上传用户：84425894
对应程序： #include<reg52.h> #define uint unsigned int #define uchar unsigned char uchar code tab[]={ 0x81, 0x42, 0x24, 0x18, }; void delay(uint z) { uint i,j; for(i=z;i>0;i--) for(j=120;j>0;j--); } void init() { P0=0x00; }
上传时间： 2014-01-17
上传用户：ruan2570406
一、 main.c(35): warning: #128-D: loop is not reachable from preceding code 原因，前面有一个while(1){ …….} 二、 main.c(54): warning: #1-D: last line of file ends without a newline 少了一个回车在}之后
上传时间： 2014-12-26
上传用户：sjb555
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.
上传时间： 2013-11-09
上传用户：gaoliangncepu
Designing Boards with Atmel AT89C51,AT89C52, AT89C1051, and AT89C2051 for Writing Flash at In-Circuit Test. Recent improvements in chips and testers have made it possible for the tester to begin taking over the role tradi-tionally assigned to the PROM program-mer. Instead of having a PROM pro- grammer write nonvolatile memories before assembling the board, the in-cir- cuit tester writes them during in-circuit testing operations. Many Teradyne Z18- series testers are now in use loading code into nonvolatile memories, micro- controllers and in-circuit programmable logic devices. The purpose of this note is to explain how the Z18 approaches the writing task for Atmel AT89C series IC’s, so that designers of boards using these chips can get the best results.
上传时间： 2013-11-17
上传用户：xiaozhiqban
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
上传时间： 2013-10-22
上传用户：归海惜雪
针对目前使用的RS232接口数字化B超键盘存在PC主机启动时不能设置BIOS，提出一种PS2键盘的设计方法。基于W78E052D单片机，采用8通道串行A/D转换器设计了8个TGC电位器信息采集电路，电位器位置信息以键盘扫描码序列形式发送，正交编码器信号通过XC9536XL转换为单片机可接收的中断信号，软件接收到中断信息后等效处理成按键。结果表明，在满足开机可设置BIOS同时，又可实现超声特有功能，不需要专门设计驱动程序，接口简单，成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot， this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller，designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter， potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU， software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot， ultrasound specific functionality can be achieved at the same time， it does not require specially designed driver，the interface is simple and low cost.
上传时间： 2013-10-10
上传用户：asdfasdfd
The MSP-FET430U14 is a powerful flash emulation tool to quickly begin application development on the MSP430 MCU. It includes USB debugging interface used to program and debug the MSP430 in-system through the JTAG interface or the pin saving Spy Bi-Wire (2-wire JTAG) protocol. The flash memory can be erased and programmed in seconds with only a few keystrokes, and since the MSP430 flash is ultra-low power, no external power supply is required. The debugging tool interfaces the MSP430 to the included integrated software environment and includes code to start your design immediately. The MSP-FET430UIF development tools supports development with all MSP430 flash devices
上传时间： 2013-10-28
上传用户：13691535575
C51使用手册 .pdf 第二节内存区域(Memory Areas)1. Pragram Area由Code 说明可有多达64kBytes 的程序存储器2. Internal Data Memory:内部数据存储器可用以下关键字说明data 直接寻址区为内部RAM 的低128 字节00H 7FHidata 间接寻址区 包括整个内部RAM 区00H FFHbdata 可位寻址区 20H 2FH3. External Data Memory外部RAM 视使用情况可由以下关键字标识xdata 可指定多达64KB 的外部直接寻址区地址范围0000H 0FFFFHpdata 能访问1 页(25bBytes)的外部RAM 主要用于紧凑模式(Compact Model)4. Speciac Function Register Memory
上传时间： 2013-11-19
上传用户：busterman
This application note describes how to decode standard DTMF tones using the minimum number of external discrete components and a PIC. The two examples use a PIC which has an 8 bit timer and either a comparator or an ADC, although it can be modified for use on a PIC which has only digital I/O. The Appendices have example code for the 16C662 (with comparator) and 16F877 (using the ADC). As the majority of the Digital Signal Processing is done in software, little is required in the way of external signal conditioning. Software techniques are used to model the individual elements of a DTMF Decoder IC.
上传时间： 2013-11-21
上传用户：zhaoke2005
