Getting confuse with interrupts and lcd with MPLAB

#include <p18f452.h>
#include <stdio.h>
#include <stdlib.h>
#include "LCD.h"
#include "delays.h"

void sendusart(unsigned char datas[17]);
void sendchar(unsigned char data);
void cls(void);
void xcl();
unsigned int meter(unsigned int me,unsigned char states);
unsigned int zav(unsigned int me,unsigned char states);

#pragma config OSC=HSPLL
#pragma config DEBUG=OFF
#pragma config WDT=OFF
#pragma config BOR=OFF
#pragma config LVP=OFF
#pragma config PWRT=ON

#pragma interrupt SerialR
void SerialR(void)
{
    if(PIR1bits.RCIF==1)
    {
        xcl();
    }
  }

#pragma code Mans=0x0008
void Mans(void)
{
    _asm
    GOTO SerialR
    _endasm
}
#pragma code

//////////////////////////Define

#define in1 PORTAbits.RA0
#define in2 PORTAbits.RA1
#define in3 PORTAbits.RA2

#define d1 PORTAbits.RA3
#define d2 PORTAbits.RA5
#define d3 PORTEbits.RE0
#define d4 PORTEbits.RE1
#define d5 PORTEbits.RE2
#define d6 PORTCbits.RC3

//////////////////////////Variable

unsigned char xs;
unsigned char i1[17];

/////////////////////////////




void main(void)
{
unsigned int i;
    ADCON1=6;
 /////timers
   TRISAbits.RA0=1;
   TRISAbits.RA1=1;
   TRISAbits.RA2=1;
   TRISAbits.RA3=1;
   TRISAbits.RA4=1;
   TRISCbits.RC0=1;
 /////  Outputs
    TRISB=0;
    TRISAbits.RA3=0;
    TRISAbits.RA5=0;
    TRISEbits.RE0=0;
    TRISEbits.RE1=0;
    TRISEbits.RE2=0;
    TRISCbits.RC3=0;

 ////////////////////
 ////////////////////
 ////////////////////

    TXSTA=0x20;
    SPBRG=25;
    TXSTAbits.TXEN=1;

    RCSTA=0x90;

    INTCONbits.GIE=1;
    INTCONbits.PEIE=1;

    PIE1bits.RCIE=1;

   // flags=0;


////////////////////
////////////////////
////////////////////


d1=0;
d2=0;
d3=0;
d4=0;
d5=0;
d6=0;
lcdinit();
i=0;
xs=0;
      cls();
      sprintf(i1,"%S","      IDLES");
      lcdprint(i1);
//////////////////////////

    while(1)
    {
        i=i+1;
      cls();
      sprintf(i1,"%d",i);
      lcdprint(i1);
      d1=~d1;
      Delay10KTCYx(1000);
    
}
}