1602 microcontroller clock stc89c52 control program contains the following files...

FAT的C语言原代码,没有底层驱动,支持打开文件,读写文件,不支持长文件名.-FAT C language source code, there is no bottom-driven support to open the document, read and write documents, do not support long file names.

在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张， 于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却 发现仍然不够用，实在没办法了就添加一个IC 来扫键。一个IC 虽然价格不高， 但对于大批量生产而且产品利润低的厂家来说，这是一笔不菲的开支! 那，我们能不能想到比较好的扫键方法：用最少的IO 口，扫最多的键？可以吗？-Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?

匠人手机之按键研究，非常不错。搞按键设计的同学可以看看从中学习下-Artisan of the key mobile phone research, very good. Button designed to engage students learn can have a look at the next

使用PIC12C508509的例程：用PIC12C508509 控制一个步进电机源程序，用PIC12C508A 控制模型源程序和用PIC12C509 控制LED。-an example program about PIC12C508509: use PIC12C508509to control stepping motor, use PIC12C508A controlling model source and PIC12C509 control LED

LT_1B msp430开发板例子程序－TA_17

MSP430编程工具，可以编程，也可回读，程序很小，非常实用。-MSP430 programming tools, can be programmed can be read-back, the program is very small, very useful.

单片机实现直流数控稳压电源,可调电压为0-9.9伏,步进为0.1伏,可以自动扫描键盘以增加或者减少电压-MCU NC Regulators DC power supply with adjustable voltage of 0-9.9 volts, stepping to 0.1 volts, can automatically scan the keyboard to increase or reduce the voltage

本文详细介绍了4×4矩阵式键盘识别技术，内含详细的电路图和C51源代码。-This paper describes a 4 × 4 matrix keyboard recognition technology, and contains detailed schematics and source code C51.

DTMF双向收／发集成电路MT8880专门为双音频信号的收、发而设计，它既能产生发送双音频信号，又能对双音频信号进行接收译码，还能判断各种信号音(拨号音、回铃音、忙音)。以上就是它的应用电路和程序-Two-way DTMF collection/fat MT8880 IC specifically for the dual audio signals received, the design, it could have sent dual audio signal, while the dual audio signal decoding receiver, but also to judge the sound signal (dial tone , ring back tone, busy tone). Above is its application circuit and procedures

51读写cf卡源码 因工程需要存储大量的数据，今天参考参考德国人的一个基于avr的cf控制程序，移植了一个51上面使用的cf驱动程序-Cf card 51 to read and write source code because the project needs a large amount of data storage, today people refer to a reference to Germany avr based on the cf control procedures, transplantation of a 51 top used cf driver