How to make the code run only on interrupt

I have the following code which is supposed to count the number of interrupts on pin P3.2 (external interrupt) and display it on UART. But this code is doing exactly opposite of it i.e. it's running when the interrupt doesn't occur (count gets incremented when there is no interrupt and count stops when there is an interrupt). Any advice on it on where I'm going wrong ? I'm using P89LV52RD2 micro controller. Thanks in advance!

#include<reg51.h>
#include<stdio.h>
#include<stdlib.h>

/* function prototypes */
void delay(unsigned int ms);
void putc1( chr);
void windspeed_read( void);
void initialize(void);
void record_wind(unsigned char c);
void puts1(char* p);
void send_data();


// global variables declared
unsigned char buf[1]={0},*ptr;
int c=0,i=0; 



/* delay function to create a delay of 1 sec */
void delay(const unsigned int ms)
{
 unsigned int x;
 unsigned int y;
 for (x = 0; x < ms; x++)
 {
 for (y = 0; y <= 113; y++)
 ;
 }
}



void puts1(char* p)
{
 char *temp = p;          /*temp pointer so that the actual pointer is not displaced */
 while(*temp != 0x00)
 {
  putc1(*temp);  
  temp++;
 } 
}



/* function to detect the wind speed */
void windspeed_read( void ) interrupt 0
{
EA=0;
c = c+1;
sprintf(buf,"%d",c);
EA=1;
}



/*init the TIMER and etc*/
void initialize()
{
 SCON  = 0x50;   /*SCON: mode 1, 8-bit UART, enable receive      */ 
 TMOD |= 0x20;   /*TMOD: timer 1, mode 2, 8-bit                  */
 TH1   = 0xFD;   /*TH1:  for 9600 baud                           */
 TR1   = 1;      /*TR1:  timer 1 run                             */ 
}



/* to print the character in UART and serial window*/
void putc1(chr)
{
    initialize();
  SBUF = chr;
  while(TI==0);            /*Wait until the character is completely sent */
  TI=0;                   /*Reset the flag */
}



/* main function */
void main()
{
initialize();
IE = 0x81;
EX0 = 1;
while(1)
{
send_data();
delay(100000);
}
}

void send_data()
{

sprintf(buf,"%d",c);
ptr = buf;
P2 = buf[0];
puts1(ptr);
}

Here is the link for the data sheet of microcontroller I'm using.