lpc2178, не может активировать таймер0 isr

Question

пытается настроить timer0, isr 4 на lpc2178

   T0TCR=(1<<1);              //Reset Timer0
   T0MR0=99999;             //Loading match register value
   T0PR=18;                  //Loading Prescalar register value
   T0PC=T0TC=0;                  
   T0MCR=(1<<0)|(1<<2);  //Generates interrupt and stop on match
   T0TCR=(1<<0);             //Starting Timer
    VICVectAddr4 = (unsigned long long)my_timer_isr;
    VICVectCntl4 = (1<<5) | 4; 
    VICIntEnable = 1<<4;