part2.1_2.c

新概念51单片机C语言教程.入门、提高、开发

#include <reg52.h>    		//52系列单片机头文件
#define uchar unsigned char
#define uint unsigned int 
sbit dula=P2^6;		//申明U1锁存器的锁存端
sbit wela=P2^7;
uchar num;		//申明U2锁存器的锁存端
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delayms(uint xms);

void main()					
{
   wela=1;
   P0=0X00;
   wela=0;
   while(1)
   {
      for(num=0;num<16;num++)
	  {  
		  dula=1;
		  P0=table[num];
		  dula=0;
		  delayms(500);
	  }
   }
}
void delayms(uint xms)				
{
	uint i,j;
	for(i=xms;i>0;i--)		      //i=xms即延时约xms毫秒
		for(j=110;j>0;j--);
}