单片机控制7289程序源码 2789可外接 按键 数码管显示等 可节省很多IO口-7289 single-chip control program 2789 may be an external key source digital tube display I can save a lot of IO

此程序意在实现利用7289进行键盘和数码管的控制，程序齐全，调试已经通过。-this set of code sucessusfully makes use of 7289 to control keyboard and led.

7289A的原理用应用，是一个实际的例子，可以用做参考-7289A with the application of the principle, is a practical example, can be used as reference