74HC573扩展单片机IO口的电路图的演示代码啊。那位高手指点下,驱动LED...答:是驱动LED数码管吧,下面是程序和电路,显示0~7,不过要注意的是时间电路中要接上晶振和复位电路。include <reg52.h> define uint unsigned int define uchar unsigned char sbit DULA = P3^0;sbit WELA = P3^1;uchar code table[]={ 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x...