51单片机模拟秒表（软件延时）

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代码：

#include <reg52.h>
#define uint8 unsigned char
#define uint16 unsigned short int

//数码管段码显示：0~f,不亮
uint8 code LED_Disp[] = {0xC0,0xF9,0xA4,0xB0,    //这一组编码当中不包含小数点
                        0x99,0x92,0x82,0xF8,
						0x80,0x90};			//十个分别显示 0 1 2 3 4 5 6 7 8 9
uint8 code LED_Disp1[] = {0x40,0x79,0x24,0x30,    //这一个数组的编码中包含小数点
                        0x19,0x12,0x02,0x78,
						0x00,0x10};			//十个分别显示 0 1 2 3 4 5 6 7 8 9

unsigned int counter = 0;
void mDelay(uint16 mtime)
{
	for(; mtime > 0; mtime--)
	{
		uint8 j = 244;
		while(--j);

	}
}
void LED_Disp_Seg7()
{

    int a[4];
    int j, k;
    j = counter%60;
    k = counter/60;
    a[3] = j%10;
    a[2] = j/10;
    a[1] = k%10;
    a[0] = k/10;
    P2 = 0xef;
    P0 = LED_Disp[a[0]];
    mDelay(5);
    P2 = 0xdf;
    P0 = LED_Disp1[a[1]];
    mDelay(5);
    P2 = 0xbf;
    P0 = LED_Disp[a[2]];
    mDelay(5);
    P2 = 0x7f;
    P0 = LED_Disp[a[3]];
    mDelay(5);



}
void timeDelay(unsigned int  time)
{
	while(time--)
	{
		 	LED_Disp_Seg7();
	}
}



void main()
{
	while(1)
	{
		timeDelay(100);
        counter++;
	}
}