延时程序

#include <reg51.h>

void delay_s()
{
    unsigned char a,b,c;
    for(c=13;c>0;c--);
        for(b=247;b>0;b--);
            for(a=142;a>0;a--)     ;

}
void delay_ms()
{
    unsigned char a,b;
    for(b=102;b>0;b--);
        for(a=3;a>0;a--);
}
int main()
{
    unsigned char SEG_CA[10] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
    unsigned char SEG_CC[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
 //    unsigned char SEG_CC[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};


    int count;
    int i,j;

    for(i=0;i<10;i++)
    {
        for(j=0;j<10;j++)
        {
            count=200;
            while(count<500)
            {
                P2=0xfe;
                P0=SEG_CC[j];
                delay_s();

                if(i>0)
                {
                    P2=0xfd;

                    P0=SEG_CC[i];


                }



                    count++;

            }
        }
    }
}