PIC单片机控制CH452的数码管显示程序

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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?

sd卡(驱动)工作原理分析，对驱动SB卡有很大帮助-sd card (driver) working principle analysis of SB card drivers are very helpful

DS18b20温度计,可以检测温度的变化，精度高-ds18b20

DSP2812 控制CY7C68001的源码,有详细的注释-DSP2812 control CY7C68001 source, there are detailed notes

本程序主要是16*2小液晶的驱动，可以显示英文字符和数字。-This procedure is 16* 2 small LCD drivers, you can display English characters and numbers.

凌阳16位单片机的启动代码，它是源码，是凌阳的公司提供的-Sunplus 16-bit single-chip start-up code, it is the source code is provided by the company of Sunplus

电动车里程表,安装在自行车上,能显示当前速度,显示总里程数,可以用来做别的,抛砖引玉-Electric vehicle odometer, installed on the bike, can display the current speed, showing the total mileage that can be used to do anything else, start

24c01的读写程序，稍加改动就可移植到自己的程序中，-24c01 reading and writing process, little change can be transplanted to their own procedures,

可编程逻辑器件在数字式抢答器中的应用 -Programmable logic devices in digital Answer Explorer Application