完成以下任务：运用89C51单片机十字路口的交通灯控制系统，四组灯（红黄绿）对应十字路口的四个方向，用两位的数码管显示剩余的时间。
仿真视频：
/video/BV1qg411o71b/
#defineuchar unsigned char#defineuint unsigned int#include<reg51.h>sbit dx_LED1=P2^2;sbit dx_LED2=P2^3;sbit dx_Red=P1^3;sbit dx_Yellow=P1^2;sbit nb_LED1=P2^0;sbit nb_LED2=P2^1;sbit nb_Red=P1^7;sbit nb_Yellow=P1^6;bit Flag_nb_Yellow;bit Flag_dx_Yellow; char Time_dx; char Time_nb; uchar dx=10,nb=10,dxL=5,nbL=5;uchar dx1=10,nb1=10,dxL1=3,nbL1=3; uchar code table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};uchar code a[9]={0X28,0X48,0X18,0X48,0X82,0X84,0X81,0X84,0x88};void delay_ms(unsigned int x){unsigned int i,j;for(i=x;i>0;i--)for(j=110;j>0;j--);}void Display(void){char t1,t2;t1=Time_dx/10;t2=Time_dx%10;P0=table[t2];dx_LED2=1;delay_ms(1);dx_LED2=0;P0=table[t1];dx_LED1=1;delay_ms(1);dx_LED1=0;t1=Time_nb/10;t2=Time_nb%10;P0=table[t2];nb_LED2=1;delay_ms(1);nb_LED2=0;P0=table[t1];nb_LED1=1;delay_ms(1);nb_LED1=0;} void timer0(void)interrupt 1{static uchar count;TH0=(65536-50000)/256;TL0=(65536-50000)%256;count++;if(count==10){if(Flag_nb_Yellow==1){nb_Yellow=~nb_Yellow;}if(Flag_dx_Yellow==1) {dx_Yellow=~dx_Yellow;}}if(count==20){Time_dx--;Time_nb--;if(Flag_nb_Yellow==1){nb_Yellow=~nb_Yellow;}if(Flag_dx_Yellow==1){dx_Yellow=~dx_Yellow;}count=0;}}void main(void){TMOD=0x01;TH0=(65536-50000)/256;TL0=(65536-50000)%256;EA=1; ET0=1;TR0=1;Time_dx=3;Time_nb=3;while(Time_nb>=0||Time_dx>=0){Flag_dx_Yellow=0;P1=a[8];Display();}while(1) {Time_dx=dx;Time_nb=nb;while(Time_nb>=4){Flag_dx_Yellow=0;P1=a[0];Display();}P1=0x00;while(Time_nb>=0){Flag_nb_Yellow=1;dx_Red=1;Display();}dx=dx1;nb=nb1;dxL=dxL1;nbL=nbL1;Time_dx=nb;Time_nb=dx;while(Time_dx>=4){Flag_nb_Yellow=0; P1=a[4];Display();}P1=0X00;while(Time_dx>=0){Flag_dx_Yellow=1;nb_Red=1;Display();}dx=dx1;nb=nb1;dxL=dxL1;nbL=nbL1;} }
