求帮助，用单片机做十字路口交通灯程序遇到问题 -

#include"reg51.h"
#define uchar unsigned char
#define uint unsigned int
unsigned char count1=0; //中断计算器
unsigned char count2=60; //红灯秒数变量
unsigned char count3=55; //绿灯秒数变量
unsigned char count4=5; //黄灯秒数变量
unsigned char type=1; //状态类型
sbit dxr=P1^0;
sbit dxy=P1^1;
sbit dxg=P1^2;
sbit nbr=P1^3;
sbit nby=P1^4;
sbit nbg=P1^5;
unsigned char led_mod[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //led的显示数~共阳极；
void delay(unsigned int time);
timer0() interrupt 1 //T0定时方式1中断函数
{
count1++; //中断次数+1，50ms过去
if(count1==20) //将1S分成20个50ms
{
count1=0;
count2--; //count2减一1表示1S过去，显示器-1
count3--;
count4--;
}
if(count2==0)
count2=60;
if(count3==0)
count3=55;
if(count4==0)
count4=5;
TH0=(65536-50000)/256; //重装初值；
TL0=(65536-50000)%256;
}
void nbr_display(uint y) // 南北向亮红灯时候的数码管函数
{
uint shi=y/10;
uint ge=y%10;
P2=0x01;
P0=led_mod[shi];
delay(1);
P2=0x02;
P0=led_mod[ge];
delay(1);
}
void dxr_display(uint y) // 东西向亮红灯时候的数码管函数
{
uint shi=y/10;
uint ge=y%10;
P2=0x04;
P0=led_mod[shi];
delay(1);
P2=0x08;
P0=led_mod[ge];
delay(1);
}
void nbg_display(uint y) //南北向亮绿灯时候的数码管函数
{
uint shi=y/10;
uint ge=y%10;
P2=0x01;
P0=led_mod[shi];
delay(1);
P2=0x02;
P0=led_mod[ge];
delay(1);
}
void dxg_display(uint y) //东西向亮绿灯时候的数码管函数
{
uint shi=y/10;
uint ge=y%10;
P2=0x04;
P0=led_mod[shi];
delay(1);
P2=0x08;
P0=led_mod[ge];
delay(1);
}
void nby_display(uint y) //南北向亮黄灯时候的数码管函数
{
uint shi=y/10;
uint ge=y%10;
P2=0x01;
P0=led_mod[shi];
delay(1);
P2=0x02;
P0=led_mod[ge];
delay(1);
}
void dxy_display(uint y) //东西向亮黄灯时候的数码管函数
{
uint shi=y/10;
uint ge=y%10;
P2=0x04;
P0=led_mod[shi];
delay(1);
P2=0x08;
P0=led_mod[ge];
delay(1);
}
void traffic()
{
if(type==1)
{nbr=1;nby=1;nbg=0;dxr=0;dxy=1;dxg=1;nbg_display(count3);dxr_display(count2);if(count2==5)type=2;}//南北绿灯，东西红灯,持续55秒
if(type==2)
{count2=5;count4=5;nbr=1;nby=0;nbg=1;dxr=0;dxy=1;dxg=1;nby_display(count4);dxr_display(count2);if(count2==0)type=3;}//南北黄灯，东西红灯，持续5秒
if(type==3)
{count2=60;count3=55;nbr=0;nby=1;nbg=1;dxr=1;dxy=1;dxg=0;nbr_display(count2);dxg_display(count3);if(count2==5)type=4;}//南北红灯，东西绿灯，持续55秒
if(type==4)
{count2=5;count4=5;nbr=0;nby=1;nbg=1;dxr=1;dxy=0;dxg=1;nbr_display(count2);dxy_display(count4);if(count2==0)type=1;}//南北红灯，东西黄灯，持续5秒
}
void main()
{
TMOD=0x01; //设置T0定时方式1，t=50ms
TH0=(65536-50000)/256; //计数初值a=2^16-50000us*12/12
TL0=(65536-50000)%256; //将a的值转化为十六进制分高低位分别赋予TH0跟TL0
EA=1; //开总中断
ET0=1; //开T0中断
TR0=1; //启动T0
while(1)
traffic();
}
void delay(unsigned int time)
{
unsigned int j=0;
for(;time>0;time--)
for(j=0;j<125;j++);
}

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