I Have written a program for my project digital amperehour meter using AT*89s8252 . the main aim of this project is to count the pulses on pin 1.3 for 1 second and display it on 16x1 lcd.

i have written a program but it is going into indefinite loop when i compiled it using kiel micro vision.

the code i have written is::::


#include<AT898252.h>
void DELAY_HARDWARE_One_Second(void);
void DELAY_HARDWARE_50ms(void);
void main(void)
{
P1 = 0xAA;
while(1)
{
TH1 = 0x00;
TL1 = 0x00;
DELAY_HARDWARE_One_Second();
P1 =~ 0xAA;
TR1 = 1;
ACC =TL1;
B = TH1;
lcd_write(1,B);
lcd_write(1,ACC); /* i have to iclude the file lcdacess.c which is working. don't mind this 2 statements/*
}
}
/*-------------------------------------------------------------*-
DELAY_HARDWARE_One_Second()
Hardware delay of 1000 ms.
*** Assumes 12MHz (12 osc cycles) ***
-*-------------------------------------------------------------*/
void DELAY_HARDWARE_One_Second()
{
char d;
/* Call DELAY_HARDWARE_50ms() twenty times */
TMOD &= 0x0F; /* Clear all T1 bits (T0 left unchanged) */
TMOD |= 0x50; /* Set required T0 bitsTMOD=0101 (T0 left unchanged) */
TR1 = 1;
for (d = 0; d < 20; d++)
{
DELAY_HARDWARE_50ms();
}
}
/*-------------------------------------------------------------*-
DELAY_HARDWARE_50ms()
*** Assumes 12MHz (12 osc cycles) ***
-*-------------------------------------------------------------*/
void DELAY_HARDWARE_50ms()
{
/* Configure Timer 0 as a 16-bit timer */
TMOD &= 0xF0; /* Clear all T0 bits (T1 left unchanged) */
TMOD |= 0x01; /* Set required T0 bits (T1 left unchanged) */

/* Values for 50 ms delay */
TH0 = 0x3C; /* Timer 0 initial value (High Byte) */
TL0 = 0xB0; /* Timer 0 initial value (Low Byte) */

TF0 = 0; /* Clear overflow flag */
ET0 = 1;
EA = 1;
TR0 = 1; /* Start timer 0 */
while(1)
{
if(flag)
P3 = 0x00;
else
P3 = 0xFF;
}
}


void Timer0_ISR(void) interrupt 1
{
TR0 = 0;
flag = !flag;
TH0 = 0x00;
TL0 = 0x01;
}


please take time and help me out of this......