8051用8255扩展I/O口接八位数码管(PA口输出控制字,PB口位选通,数码管采用的是共阴极的).此程序可以实现动态显示,并且可以人机交互,当要修改某一位时,此位会闪烁,就像电脑中的光标一样一闪一闪的.当输入确定后可自动转入下一位,可用来选择不同的程序来远行(看自己怎么来了)-8051 with 8255 expansion I/O port access 8 digital tube (PA port output control word, PB mouth bit strobe, digital control is used a total of cathode). This process can realize dynamic display, and can be interactive, when To modify a particular time, this place will be blinking, just like a computer cursor, like a flash of fleeting. When the input is determined automatically transferred to the next can be used to choose a different procedure to travel (look how their own come)