ISR is not excuting any body help

Hi every body i am using lpc2129 , compiler is keil uvision 4 in simulation(debugging) mode isr is not executing any body help me .im not able to find the whats the problem.i have write code for timer match interrupt.in this code no errors no warnings. isr is not excuting...

#include<lpc21xx.h>
unsigned long test=0;
void toisr(void) __irq
{ test++;
toir=0x1;
VIcvectaddr=0x00;
} void Init_PLL(void)
{ PLLCFG = 0x24;

/* Enable PLL0 */ PLLFEED = 0xAA; PLLFEED = 0x55; PLLCON = 0x01; PLLFEED = 0xAA; PLLFEED = 0x55;

/* Update PLL Registers with Feed Sequence */ PLLFEED = 0xAA; PLLFEED = 0x55;

// Check the Lock Bit while(Is_Bit_Clr(PLL0STAT,BIT10));

PLLCON = 0x03; PLLFEED = 0xAA; PLLFEED = 0x55; MAMCR = 0x02; MAMTIM = 0x04; VPBDIV = 0x01; // PCLK = CCLK
} void Init_Timer0(void)
{ Set_Bit(PCONP,BIT1);// T0PR = 59;

T0MR0 = 999; /* 1mSec = 1000 -1 counts */

T0MCR |= (1<<BIT1) | (1<<BIT0); /* Interrupt and Reset on MR0 */

}
init_vic()
{ VICEnclr=0x00; VICVEctaddr=(unsigned long)t0isr; VICcntl=0x24; VICIntenble=(1<<4);
} int main()
{ Init_pll(); Init_Timer0(); init_vic(); Totcr|=(1<<0); while(1);
}