Traffic light program of 51 MCU + 8155 chip

The microcontroller source program is as follows:

#include

# include

#define uchar unsigned char //Defined as uchar type

#define uint unsigned int //Defined as uint type

#define COM XBYTE[0XFE00] //Control word address (overall control, determines whether PA/B/C is writing or reading, etc.)

#define PA XBYTE[0XFE01] //Control PA address (when the total control is written to read, the value stored in it is the read value;

                                                           // When writing, the control value should be written in it)

#define PB XBYTE[0XFE02] //control PB address

#define PC XBYTE[0XFE03] //Control PC address

sbit g = P2^1;

sbit s = P2^2;

sbit eg = P2^3;

sbit ws = P2^4;

//sbit Key_N = P1^4; //Independent key

//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; //define global variables

if m = 30;

uint n;

whether

/*Traffic light value*/

uchar lcd1 = 10; //The countdown initial value is 25 for changing

uchar lcd2 = 15; //The countdown initial value is 30 for changing

uchar lcd11; // countdown

uchar lcd22; // countdown

uchar change1; //LCD1 traffic light switch

uchar yellow1 = 3;

/*Declaration of some auxiliary flags*/

uchar code smguan[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //digital tube displays 0~9

flying t=3;

volatile sign = 0;

uchar time_Count; //Counting

void delay(uint t)

{

          while(t--);

}

void Digital(uint ge,uint shi) //digital tube display

{         

                  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;

}