LPC2148: Probleme mit Timer0 Capture-Interrupt

// initialize the interrupt vector 

VICIntSelect &= ~VIC_BIT(VIC_TIMER0);  // TIMER0 selected as IRQ 

VICVectCntl4 = VIC_ENABLE | VIC_TIMER0;  // TIMER0 on VIC vector 4 

VICVectAddr4 = (uint32_t)ButtonISR;  // address of the ISR 

VICIntEnable = VIC_BIT(VIC_TIMER0);  // TIMER0 interrupt enabled 

// Port P0.28 -> AD0.1/Capture 0.2

// PIN 25:24

PINSEL0 = (PINSEL0 & ~0x03000000) | 0x02000000;

// enable timer0 interrupt on faling edge of CR2 capture

T0CCR |= TCCR_CR2_I | TCCR_CR2_F;