SD2403A clock chip in the source code under the STC in this single

电子设计工程师手册第五版，模拟部分，详细介绍模拟电路基础-Electronics Design Engineer Manual, Fifth Edition, analog section, details of the basis of analog circuits

单片机在液晶上实现菜单-To achieve single-chip LCD menu !!!!!!!!!!!

DM355LCD模块参考，官方下载的，有些可以参考-DM355LCD module reference, the official download, and some can refer to

w77e58单片机的双串口 的操作，寄存器的设置和 串口读写等-w77e58 SCM dual serial operation, the setup and register read and write, etc. Serial

单片机w77e58的中文资料，欢迎需要的同志下载-Singlechip W77E58 Chinese information, please download the need for comrades

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?

由P89V51RB2单片机控制小车在翘翘板上寻找平衡点,装载倾角传感器.-By SCM P89V51RB2 car in the seesaw to find the equilibrium point, loading angle sensor.

2片显示驱动芯片HT1622的C51底层程序-two display driver chip HT1622 the bottom procedures C51

利用NRF9e5芯片编写的C51源代码，可实现点到点无线通信接收部分。-NRF9E5 chips prepared using C51 source code, can be achieved to receive part of point-to-point wireless communications.

此程序为是用在电子警察上面的，模拟 红绿灯信号用的，-this procedure is used in electronic police above, mock traffic light signals are used,