Not Getting into the ISR

Hi,

<bI am exploring the MCB2300 board with simulator. I am trying to generate a some signal at MAT0.0.

It is working fine, except that not entering into the ISR.

WHile observing the simulation, when MR0=TCR, interrupt generated,

VICVectAddr took the address of VICVectAddr4. But then it is not taking the address 0, which is last line of ISR.>

Here is the code.

#include <stdio.h>
#include <LPC23xx.H> /* LPC23xx definitions */
#include "LCD.h" /* Graphic LCD function prototypes *

extern __irq void T0_IRQHandler (void);

int main (void) {

int i=0;

PCLKSEL0 |=0x00000000; // pclk=cclk/4=18MHz PINSEL3 |=0x03000000; // Select MAT0.0 Pin 44 P1.28 T0PR=5000; T0MR0=1800-1; // To generate a 1 sec pulse with 18 Mhz Pclk clock T0MCR=3; // Interrupt generated & reset TC on match T0EMR=0x30; // T0TCR=1; //ENABLE Timer VICVectAddr4 = (unsigned long)T0_IRQHandler;/* Set Interrupt Vector Gives ISR Address to VICVectAddr4 */ VICVectCntl4 = 15; /* use it for Timer0 Interrupt */ VICIntEnable = (1 << 4); /* Enable Timer0 Interrupt It gives the content of VICVectAddre4 to VICVectAddr */
}

Here is the ISR

#include <LPC23xx.H> /* LPC23xx definitions */

__irq void T0_IRQHandler (void) {

T0IR|=0x01; // clear interrupt register VICVectAddr=0;//acknowledge interrupt

}

According to the last line of ISR, VectAddre should become 0, which is not happening; while observing the simulator.

Even I tried with disabling the T0TCR=0 as the 1st line of ISR to disable the timer. But TC continues to increase, even after interrupt occured.

Can some body tell me ; what exactly I am missing.

Thanks in advance

Sri