RTC with PCF8583 and PIC16F877A in Microc

struct TTime {
  char year, month, day, hours, minutes, seconds;
} TimeRead;

      struct Wr_TTime {char year, month, day, hours, minutes, seconds;
} TimeToWrite;

char yearmod4, byteRead;

void Display_Time() {
unsigned  const digit[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
 char txt[4];

   TRISB=0;
   PORTB.RB1=0;
   PORTB.RB2=0;
   PORTB.RB3=0;
   PORTB.RB0=1;
   txt[0]=TimeRead.hours / 10;
   PORTD=digit[txt[0]];
   delay_us(5);
    //end first digit
   TRISB=0;
   PORTB.RB0=0;
   PORTB.RB2=0;
   PORTB.RB3=0;
   PORTB.RB1=1;
   txt[1]=TimeRead.hours % 10;
   PORTD=digit[txt[1]];
   delay_us(5);

   //end second digit
   TRISB=0;
   PORTB.RB1=0;
   PORTB.RB2=1;
   PORTB.RB3=0;
   PORTB.RB0=0;
   txt[2]=TimeRead.minutes / 10;
   PORTD=digit[txt[2]];
   delay_us(5);
   //end third digit

   TRISB=0;
   PORTB.RB1=0;
   PORTB.RB2=0;
   PORTB.RB3=1;
   PORTB.RB0=0;
   txt[3]=TimeRead.minutes % 10;
   PORTD=digit[txt[3]];
   delay_us(5);
   //end fourth digit
}


void ReadTime() {
char updateYear;

   updateYear = 0;

   I2C1_Start();                // issue start signal
   I2C1_Wr(0xA0);               // address PCF8583
   I2C1_Wr(2);                  // first word address
   I2C1_Repeated_Start();       // issue repeated start signal
   I2C1_Wr(0xA1);               // address PCF8583 for reading R/W=1


   byteRead = I2C1_Rd(1u);     // read minutes byte
   TimeRead.minutes = (byteRead >> 4)*10 + (byteRead & 0x0F); // transform minutes
   while (!I2C1_Is_Idle())
     asm nop;

   byteRead = I2C1_Rd(1u);     // read hours byte
   TimeRead.hours = (byteRead >> 4)*10 + (byteRead & 0x0F); // transform hours
   while (!I2C1_Is_Idle())
     asm nop;
   byteRead = I2C1_Rd(0u);     // read weekday/month byte
   TimeRead.month = ((byteRead & 0b00010000) >> 4)*10 + (byteRead & 0x0F); // transform month
   while (!I2C1_Is_Idle())
     asm nop;
   I2C1_Stop();

   I2C1_Start();                 // issue start signal
   I2C1_Wr(0xA0);               // address PCF8583
   I2C1_Wr(0x10);               // first word address
   I2C1_Repeated_Start();        // issue repeated start signal
   I2C1_Wr(0xA1);               // address PCF8583 for reading R/W=1

   byteRead = I2C1_Rd(0u);     // read year
   if (yearmod4 != byteRead % 4 ) { // check if year is incremented in RTC
       byteRead++;  // in this case the new value should be written to RTC RAM at address 16(0x10)
       updateYear = 1;
       }
   TimeRead.year = byteRead;

   while (!I2C1_Is_Idle())
     asm nop;
   I2C1_Stop();

   if (updateYear > 0) {
      I2C1_Start();            // issue start signal
      I2C1_Wr(0xA0);          // address PCF8530
      I2C1_Wr(0x10);          // start from word at address 16
      I2C1_Wr(TimeRead.year);         // write year to RAM
      I2C1_Stop();             // issue stop signal
      }
}
void MainInit() {

  CMCON = 0x07;
  I2C1_Init(100000);          // initialize I2C
}
void write_time(void)
  {
   TimeToWrite.hours   = 22;
   TimeToWrite.minutes = 10;
   I2C1_Start();            // issue start signal
   I2C1_Wr(0xA0);          // address PCF8583
   I2C1_Wr(0);            // start from word at address 0 (configuration word)
   I2C1_Wr(0x80);          // write 0x80 to config. (pause counter...)
   I2C1_Wr(0);            // write 0 to cents word
   I2C1_Wr(((TimeToWrite.minutes/10)<<4) + (TimeToWrite.minutes%10)); // write minutes word
   I2C1_Wr(((TimeToWrite.hours/10)<<4) + (TimeToWrite.hours%10)); // write hours word
   I2C1_Stop();             // issue stop signal

   I2C1_Start();            // issue start signal
   I2C1_Wr(0xA0);          // address PCF8530
   I2C1_Wr(0x10);          // start from word at address 16
   I2C1_Wr(TimeToWrite.year);         // write year to RAM
   I2C1_Stop();             // issue stop signal

   I2C1_Start();            // issue start signal
   I2C1_Wr(0xA0);           // address PCF8530
   I2C1_Wr(0);              // start from word at address 0
   I2C1_Wr(0);              // write 0 to config word (enable counting)
   I2C1_Stop();             // issue stop signal

   }
void main() {
     MainInit();
     write_time();
   while (1) {

     ReadTime();
     Display_Time();
     Delay_ms(1000);
     }
}

Delay_ms(1000);