单片机源程序如下:

#include

# include

#define uchar unsigned char //定义为uchar类型

#define uint unsigned int //定义为uint类型

# define COM XBYTE[0XFE00] //控制字地址（总控制，决定了PA/B/C是写还是读等）

# define PA XBYTE[0XFE01] //控制PA地址（总控制写的是读时，里面存的是读的值；

// 写的是写时，里面要写入控制值）

# define PB XBYTE[0XFE02] //控制PB地址

# define PC XBYTE[0XFE03] //控制PC地址

sbit g = P2^1;

sbit s = P2^2;

sbit eg = P2^3;

sbit ws = P2^4;

//sbit Key_N = P1^4; //独立按键

//sbit Key_S = P1^5;

//sbit Key_W = P1^6;

//sbit Key_E = P1^7;

sbit KEYA = P1^4;

sbit KEYB = P1^5;

uint ge,shi; //定义全局变量

uint m = 30;

uint n;

uint num;

/*交通灯的数值*/

uchar lcd1 = 10; //倒计时初始值为25用于改变

uchar lcd2 = 15; //的倒计时初始值为30用于改变

uchar lcd11; //倒计时

uchar lcd22; //倒计时

uchar change1; //LCD1红绿灯转换

uchar yellow1 = 3;

/*一些辅助标志位的声明*/

uchar code smguan[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //数码管显示0~9

uchar t=3;

uchar sign = 0;

uchar time_Count; //进行计时

void delay(uint t)

{

while(t--);

}

void Digital(uint ge,uint shi) //数码管显示

{

PA = smguan[ge];

s = 1;

delay(500);

s = 0;

PA = smguan[shi];

g = 1;

delay(500);

g = 0;

PB = smguan[ge];

eg = 1;

delay(500);

eg = 0;

PB = smguan[shi];

ws = 1;

delay(500);

ws = 0;

}

void Traffic_lights()

{

if(t == 3)

{

P1 = 0x01;

if(m == 0)

{

m = 3;

t = 2;

}

}

if(t == 2)

{

P1 = 0x02;

if(m == 0)

{

m = 30;

t = 1;

}

}

if(t == 1)

{

P1 = 0x04;

if(m == 0)

{

m = 3;

t = 0;

}

}

if(t == 0)

{

P1 = 0x02;

if(m == 0)

{

m = 30;

t = 3;

}

}

}

void INIT()

{

IT0=1;

IT1=1;

EX0=1;

EX1=1;

EA=1;

}