51 microcontroller: application of timer and interrupt system

#include "regx52.h"

void Delay(int time)
{     while(time--) //The while loop takes 10us     {     } }

 void Timer0Init(void) //1 millisecond @11.0592MHz
{

    TMOD &= 0xF0; //Set the timer mode
    TMOD |= 0x01; //Set the timer mode
    TL0 = 0x66; //Set the initial timer value
    TH0 = 0xFC; //Set the initial timer value
    TF0 = 0; //Clear TF0 Flag
    TR0 = 1; //Timer 0 starts timing
    ET0 = 1;
    EA = 1;
    PT0 = 0;
}

 
int i,count,LEDMode;
 
// What needs to be executed after the interrupt
void Timer0_motion() interrupt 1
{  
    TL0 = 0x66; //Set the initial timing value
    TH0 = 0xFC; //Set the initial timing value
    
       count++;
   if(count == 500 )
   {    
           if(LEDMode == 0) //LED light moves left
        {             if(i>=8)i=0;                     P2=~(0x01<<i);             i++;         }

        if(LEDMode == 1) //LED灯右移
        {
            if(i<0)i=7;
            P2=~(0x01<<i);
            i--;
        }
           
          count=0;
   }

}

//Signal processing for independent keys
int Key(void)    
{

    int KeyNumber = 0;
    if(P3_1==0){Delay(1000);while(P3_1==0);Delay(1000);KeyNumber = 1;}
    if(P3_0==0){Delay(2000);while(P3_0==0);Delay(2000);KeyNumber = 2;}
    if(P3_2==0){Delay(2000);while(P3_2==0);Delay(2000);KeyNumber = 3;}
    if(P3_3==0){Delay(2000);while(P3_3==0);Delay(2000);KeyNumber = 4;}

    return KeyNumber;
}

int main()
{     int KeyNum;     //Timer initialization     Timer0Init();      while(1)      {          KeyNum=Key(); //Receive and return the status of independent keys           if(KeyNum)        {                if(KeyNum == 1)             {               LEDMode++ ;               if(LEDMode>=2)LEDMode=0;                 }                }      }     return 0; } 

    














    

Experimental phenomena