Kicad的中文入门手册，才翻译的，国外的开源PCB绘图软件

直接频率合成仿真源程序,希望有人能用到.-Direct frequency synthesizer simulation source code, hope someone can use to.

51单片机实用子程序 里面有很多单字节,多字节和定点浮点数的运算子程序,初学者可以看,还不错我也是从其它网上找的. -51 SCM utility subroutine There are so many single-byte, multibyte, and fixed-point floating-point arithmetic subroutines, beginners can look, well I am also looking for from the other online.

Bit Handling Library for AVR PRO Compiler

1602 液晶显示子程序 可直接套用 代替数码管显示必备-Liquid crystal display subroutine 1602 can be directly applied to replace the digital display must

ZLG7289键盘显示接口芯片是一个很常用的接口芯片，至需4个IO口接可以控制显示8位的数码管显示和64个矩阵键盘的自动扫描，效果很好。-ZLG7289 keyboard display interface chip is a very common interface chip, to take four IO access can be controlled mouth shows 8 digital tube display and keyboard matrix 64 automatically scans, very good.

采用CYGNAL F015单片机，用于一个电池老化试验柜（即循环充放电）的实用程序，实现了SMBUS总线通信协议。-used CYGNAL macroeconomic microcontroller, for a battery aging test counters (that is, charge-discharge cycle), the practical procedures to achieve the SMBUS bus communication protocols.

飞利浦RC522芯片源代码。该芯片主要针对三表市场和手持设备，支持I2C/SPI/UART接口。 先发布基于普通51单片机的驱动源代码，采用串口接口，无需中断。只要接一个串口，后续会发布基于飞利浦LPC9401的读写源代码！LPC9401也是基于51核，只需连接SPI接口！有公司拿这个源代码卖钱哟-Philips RC522 chip source. The chip targeted at three tables and handheld devices market, support I2C/SPI/UART interface. Based on the first general release 51 MCU-driven source code, using serial interface, without interruption. As long as a serial port access, the follow-up will be issued based on the Philips LPC9401 write source code! LPC9401 is based on the 51 nuclear, only connecting SPI interface! A company with the source code acquisition yo! !

本程序是用Keil c51 和Protues 联合开发的推箱子的小游戏，采用的87C51芯片，采用8×8位点阵液晶显示人物和箱子，每个点都是16×16位点阵。-This procedure is used Keil c51 and Protues the joint development of the Sokoban game, using the 87C51 chip, using 8 × 8 bit characters and dot-matrix liquid crystal display boxes, each point is 16 × 16 bit matrix.

能实现功能有：显示年、月、日、星期、时、分、秒、阴历月日、温度，共21位数码管。其中星期和阴历月日能根据公历自动计算改变，到2050年之前有效。温度可以测量从-10到40℃之间的温度。还可以设定两个定时、12/24小时显示、自动亮暗切换的时间等。 电路只用了两片IC，一片M48，另外一片是74LS145，4-10译码器，来扩充端口。具体电路在下面，是PROTEUS画的，给个图片做参考-To achieve functions: Display year, month, day, week, hour, minute, second, lunar month, the temperature, a total of 21 digital tube. One week and the lunar month on the Gregorian calendar automatically calculated based on changes effective prior to 2050. Can measure temperatures from-10 to 40 ℃ temperature between. Also can set two time, 12/24 hour display, automatic light switch dark time. Circuit used for only 2 IC, an M48, the other is a 74LS145 ,4-10 decoder to expand the port. Specific circuit in the following is the PROTEUS painting, a reference to a picture