Timer interrupt 0~100 seconds-EEWORLD

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The circuit is very simple, I won't draw a picture, the four-digit digital tube is connected through two 74hc595, one 595 is responsible for segment selection, and the other 595 is responsible for bit selection. The timer interrupt of the microcontroller is used to realize the 0-100 digital cycle display. The program has passed my test.

#include
#define uint unsigned int
#define uchar unsigned char
sbit rck=P0^0;
sbit sck=P0^1;
sbit si=P0^2;
uchar num[]={0x80,0xed,0x42,0x48,0x2c,0x18,0x10,0xcc,0x00,0x08};
uint b=0,i=0,j=0,k;
void write_595(uchar x) // Initialize the 595 chip
 {
  for(k=0;k<8;k++) //shift register
   {
    x>>=1;
 sck=0;
 si=CY;
 sck=1;
   }
 }
void date_danpianji()//Initialize the MCU timer

 {
  EA=1; //General interrupt enabled
  ET1=1; //Timer on
  TMOD=0X10; //Select timer working mode
  TH1=(65536-33333)/256; //Division is assigned to the upper eight bits
  TL1=(65536-33333)%256; //The remainder is assigned to the eighth bit
  TR1=1; //Start the timer
 }
void main()//main function
 {
  date_danpianji(); //Call timer interrupt
  while(1) // loop
   {   
    if(b==20) //Check if the interrupt function satisfies b==20, if so, execute
     {
   b=0;
   i++;
   if(i==10)
    {
     i=0;
     j++;
     if(j==10)j=0;
    }
  }
    write_595(num[j]);
    write_595(num[i]);
    rck = 0 ;
    rck = 1 ;
   }
 } 
void ext() interrupt 3 using 1 //timer interrupt
{
  TH1=(65536-33333)/256;
  TL1=(65536-33333)%256;
  b++;
}

Reference address：Timer interrupt 0~100 seconds

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