数码管动态扫描三种实现方法

以下是3个程序的源码：
/**********利用定时器定时50毫秒动态扫描数码管***********/
/**
*功能：定时器T1实现数码管动态扫瞄123456(if)
*作者：徐冉
*日期：2013-06-12-22：10
*备注：不同的方法实现显示设备的动态扫描，节约能耗
**/
/****************AT89C52-RC MCU*************/
/****************51hei开发板*************/
#include
typedef unsigned int uint;
typedef unsigned char uchar;
sbit wela = P2^7;
sbit dula = P2^6;
//段选数据编码表
uchar code table[] = {
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x6F //"9"
};
//位选数据编码表
uchar code table1[] = {
0xfe,
0xfd,
0xfb,
0xf7,
0xef,
0xdf
};
uchar j = 1, counter = 0;
//延时程序
void display()
{
dula = 1;
P0 = table[j++];
dula = 0;
if(j >= 7)
{
j = 1;
}
}
//刷新程序
void refrash()
{
static uchar i = 0;
if(0 == i)
{
wela = 1;
P0 = table1[0];
wela = 0;
}
if(1 == i)
{
wela = 1;
P0 = table1[1];
wela = 0;
}
if(2 == i)
{
wela = 1;
P0 = table1[2];
wela = 0;
}
if(3 == i)
{
wela = 1;
P0 = table1[3];
wela = 0;
}
if(4 == i)
{
wela = 1;
P0 = table1[4];
wela = 0;
}
if(5 == i)
{
wela = 1;
P0 = table1[5];
wela = 0;
}
i++;
if(i >= 6)
{
i = 0;
}
}
//定时器T1初始化
void init()
{
P0 = 0x00;//关闭数码管显示
TMOD = 0x11;
TH1 = 0xFC; //T1定时1毫秒
TL1 = 0x66;
TR1 = 1;
EA = 1;
ET1 = 1;
}
//主程序
void main(void)
{
init();
while(1)
{
if(counter == 50)
{
counter = 0;
display();//显示
refrash();//刷新
}
}
}
//T1中断服务程序
void timer1_int() interrupt 3
{
TH1 = 0xFC;
TL1 = 0x66;
counter++;
}