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error in working

I am working on mcb2300 board. I want to generate a pulse from it.I wrote a programme for this.but when I run this program in the board all values got changed.the same program works efficiently in simulation.but on it is not working properly.My program code is as

#include <LPC23xx.H> /* include for LPC23xx */ void PWMInit()
{ /* considering LPC2368 */
PINSEL3 |= (0x02<<8); /* reset PWM counter */
PWM1TCR = 0x02; /* setup match control to reset on MR0 */
PWM1MCR = 0x02; /*Reset on PWWMR0*/
/* select single edge for PWM1.1... and enable PWM1.2 o/p */
PWM1PCR = (1 << 10); /* setup PWM period */
PWM1MR0 = 12000000000/500; /* setup PWM duty cycle (50%) */
PWM1MR2 = PWM1MR0/2; /* start counter and enable PWM */
PWM1TCR = 0x81; /* enable LER */
PWM1LER = 0x04;
} int main()
{ PWMInit();
while(1);
} please help me....