Pic16f690 interfacing wih two 7 segment using 7447 delay using timer 0

[Hirenn]

Hi Everyone

i'm using PIC16f690 interface with two seven segment by 7447

im making 0 to 99 counter by using timer 0 of pic controller

i write a code but it shows only ''0'' on my both 7 segment…

can anybody please help me to figure out the problem

Thanks

#include <htc.h>                          // hi tech compiler for pic16

#define _XTAL _FREQ 4000000       // 4 Mhz freq

int overflow = 0;                       // counter variable for 0 to 99

 

void interrupt ISR(void)           // timer interrupt

{

   if(T0IF)

   {

      overflow++;

      T0IF=0;

      }

   }

 

void timer0()

{

   PSA = 0;

   T0CS = 0;

   

   PS1 =1;                          //prescaler 1:256

   PS2 =1;

   PS0 = 1;

   T0IE = 1;

   T0IF=0;

   GIE = 1;                         // global interrupt enable

   

   }

void main(void)

 {

    unsigned short second=0;

    unsigned short x,y=0;             // for display on segment

    TRISC = 0;

    TRISB7 = 1;

    ANSEL = 0x00;

    ANSELH = 0x00;

    TMR0 = 0;

    timer0();                       //timer0 function

   while (1)

   {

      if(overflow==15)

      {

     second++;

     overflow = 0;

      }

 

     if(second>99)

     {

        second =0;

        }

        x = second/10;

        y = second%10;

        PORTC = (y<<4)+x; // PORTC connected with 7 segment via 7447

      }

 }

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