LPC2366 uart2 can't receive data

hello,I use KEIL uvision and ulink2 to test the uart of lpc2366.
And the Uart0 can transmit and receive data fine;
when change the code to use uart2, the uart2 only can transmit data, but lpc2366 will reset and can't receive data when host transmit data to lpc2366;
I had checked the code several times. I find the lpc2366 can't go into the interrupt, but I can't deal with it.
I think the code to initial UART VIC has some wrong.

The code of UART2 is as follow:

#define         UART2_BAUD      (9600)
#define         UART2_INT       28
uint8           rcv2_buf[16];
volatile        uint8 rcv2_new;
void __irq IRQ_UART2 (void)
{
        uint8 i;
        uint32 IIR      = 0;

        while (((IIR = U2IIR) & 0x01) == 0)
        {
                switch (IIR & 0x0e)
        {
            case 0x02:
                break;
            case 0x04:                                                  //Rx FIFO
                for (i=0; i<8; i++)
                                {
                                        rcv2_buf[i] = U2RBR;
                                }
                break;

            case 0x0c:                                                  //CTI
                for (i=8; i<16; i++)
                                {
                                        rcv2_buf[i] = U2RBR;
                                }
                                rcv2_new=2;
                                IO0CLR |= 0x3<<27;
                break;

            case 0x06:
                break;
            default :
                break;
                }
        }
        VICVectAddr = 0x00;
}

void UART2_Init(void)
{
        uint32  Fdiv = 0;

        PCONP  |= 1 << 24;
        PINSEL0 |= (0x01 << 20) | (0x01 << 22);

        U2LCR    = 0x83;                                                //
        Fdiv     = (Fpclk / 16) / UART2_BAUD;   // set uart2 baud
        U2DLM    = Fdiv / 256;
        U2DLL    = Fdiv % 256;
        U2LCR    = 0x03;                                                // DLAB=0

        U2FCR   |= 0x87;                                                //

        U2FDR   &= ~0x0f;                                           // DIVADDVAL=0
        U2FDR   |=  0x10;                                               // MULVAL=1

        U2IER    = 0x05;

        /* init UART VIC */
        VICIntEnClr  |= 1 << UART2_INT;
        VICVectPri8   = 0x05;
        VICVectAddr8  = (uint32)IRQ_UART2;
        VICIntEnable |= 1 << UART2_INT;

}