为了更加深刻的使用到ACPI的相关资料，书写上传资料的详细功能。...

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?

source led giao tiep qua cong LPT

液晶LCD1604+温度DS18B20+时钟DS1320 的C语言开发程序。及其在PROTEUS下的原理图-LCD LCD1604+ Temperature DS18B20+ Clock DS1320 C-language development program. And its application in the schematic diagram PROTEUS

芯片HT1623驱动段码液晶屏显示；通过开辟显存区；利中断定时刷新三排数码管显示；-Chip HT1623 Drive Segment LCD display through the creation of memory area Lee interrupted refresh three rows of digital tube display

128x64点阵液晶屏驱动，KeilC51编写-128X64 dot matrix LCD driver, KeilC51 prepared

ps2键盘的命令集，编写键盘驱动时有用。EDH:置位/复位 LED 指示器。键盘右上角有三个 LED 指示器,分别反映 Caps、Num 和 Scroll 三个键的 锁定情况。参数字节如表 2 所列。 -ps2 keyboard command set, the preparation of useful keyboard-driven. EDH: Set/reset LED indicator. The upper right corner of the keyboard has three LED indicators, respectively, reflecting the Caps, Num and Scroll Lock keys in three cases. Parameter bytes as listed in Table 2.

51系列单片机的软件串口模拟程序代码，可以实现串口扩展功能，经过项目验证可以直接放心使用，用c写成-51 series microcontroller simulation software serial code, can achieve serial expansion function, After certification projects can directly worry about, written with c

AVR单片机应用开发指南及实例,包含许多实例,挺不错-AVR single-chip application development guidelines and examples, including many examples of very good

在网络中,有时候会想检查自己电脑的端口的状态,这是端口扫描器的C语言源代码, -err

一个完整的STC89LE5412程序，实现２路电压，２路电流采样，滤波，和瞬间功率峰值计算-A complete STC89LE5412 procedures, to achieve 2-way voltage, 2-way current sampling, filtering, and calculation of instantaneous peak power