求大神帮忙看看这个程序为什么不能动态显示0-59秒

#include<reg52.h>
#define uchar unsigned char
void delay(uchar i);
sbit P1_0=P1^0;
sbit P1_1=P1^1;
uchar j=0,k=0,led[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
void delay(uchar i)
{
uchar m;
for(m=0;m<i;m++);
}
void delay1s()
{
uchar i;
for(i=0;i<20;i++)
{
TH1=0x3c;
TL1=0xb0;
TR1=1;
while(!TF1);
TF1=0;
}
}
void delay10s()
{
uchar i;
for(i=0;i<200;i++)
{
TH1=0x3c;
TL1=0xb0;
TR1=1;
while(!TF1);
TF1=0;
}
}
void miaozhong()
{
for(k=0;k<6;k++)
{
P1_1=1;
P1_0=0;
P0=led[k];
delay1s();
for(j=0;j<10;j++)
{
P1_0=1;
P1_1=0;
P0=led[j];
delay1s();
}
}
}
void main()
{
TMOD=0x10;
TH1=0x3c;
TL1=0xb0;
TR1=1;
while(1)
{
miaozhong();
P1_0=0;
P0=led[k];
delay(5);
P1_1=0;
P0=led[j];
delay(5);
}
}