1.c

C51 程序练习

//利用动态扫描方法在8位数码管上显示出稳定的87654321
#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar temp,wela,dula,num;
//P0位选 P1断选
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};//0到F表格


void delay(uint z)//延时子程序
{
	uint x,y;
	for(x=z;x>0;x--)
		for(y=110;y>0;y--);
}

void main()
{
	temp=0x7f;
	P0=temp;
	while(1)
	{
		for(num=1;num<9;num++)
		{
			temp=_crol_(temp,1);
			delay(5);
			P0=temp;
			P1=table[num];
			delay(5);
		}
	}
}