图7.最小系统原理图

附录二：程序清单

#include<reg51.h>

#define uchar unsigned char

#define uint unsigned int

uchar code LED[]={0xfe,0xff,0xff,0xdf,0xff,0xbf,0xff,0xfe,0xff,0xef}; //义流水灯点亮顺序

void delay(uint x) //延迟函数

{ int i;

while(x--)

for(i=0;i<120;i++);

}

void Port(char c) //定义单片机向串口输出数据子函数

{ SBUF=c;

while(TI==0);

TI=0;

}

定