#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit BD=P3^0;		//藍(lán)燈
sbit RDa=P3^1;		//紅燈
sbit YD=P3^2;		//黃燈
sbit key1=P3^3;		//幼兒
sbit key2=P3^5;		// 兒童
sbit key3=P3^6;		//中年
sbit key4=P3^7;		//老年
sbit ZS=P1^7;       //綠燈
sbit XH=P3^4;	

uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f};
uchar shu,maibo,aa,bai,shi,ge;
void init();

void delay(uint z)			//延時(shí)
{
	uint x,y;
	for(x=z;x>0;x--)
		for(y=110;y>0;y--);
}
void main()
{	

		while(XH==1)
		{
			delay(300);
		}
		while(XH==0)
		{
			delay(300);
		}
		ZS=0;	//確實(shí)有脈沖信號(hào)時(shí) 綠燈亮	
		
		init();
		while(1)
		{
			while(TR1==1)
			{
				shu=TL0|(TH0<<8);
			}
			maibo=shu*6;
					
			bai=maibo/100;
			shi=maibo%100/10;
			ge=maibo%10;
			P0=table[bai];
			P2=table[shi];
			P1=table[ge];

		//按鍵選擇
			if(key1==0)
			{
				if(maibo<80)
					YD=0;
				if(maibo>150)
					RDa=0;
				else
					BD=0;
							
			}
			
			if(key2==0)
			{
				if(maibo<70)
					YD=0;
				if(maibo>110)
					RDa=0;
				else
					BD=0;
							
			}
			
			if(key3==0)
			{
				if(maibo<60)
					YD=0;
				if(maibo>100)
					RDa=0;
				else
					BD=0;
							
			}
							
			if(key4==0)
			{
				if(maibo<50)
					YD=0;
				if(maibo>100)
					RDa=0;
				else
					BD=0;
							
			}	

		}
}

void init()		//初始化
{	
	shu=0;
	TMOD=0x15;
	TH1=(65536-50000)/256;
	TL1=(65536-50000)%256;
	TR0=1;//計(jì)數(shù)器0開始
	TR1=1;
	EA=1;
	ET1=1;
		
}

void timer1() interrupt 3		//定時(shí)器1中斷
{
	TH1=(65536-50000)/256;
	TL1=(65536-50000)%256;
	aa++;
	if(aa==200)
	{
		aa=0;
		TR1=0;
		TR0=0;
		
	}	
}