CCS/TMS320F2812: Why PDPINTA interrupt happen without stimulation؟

Tool/software: Code Composer Studio

Hi,

Am trying XINT1 using TMS320F2812 in a test card.

InitXIntrupt sometimes works sometimes doesn't,

Even though PDPINTA  interrupt (INT1.1) is not active, it still happens 

my code:

#include "DSP28_Device.h"

//unsigned  int  *LedADDR  = (unsigned int *)0x4600;    //LED control register
interrupt void ExtIntISR(void);
Uint16    Temp;

void main(void)
{

    InitSysCtrl();                    //initialize the system

    DINT;                            //disable interrupts
    IER = 0x0000;
    IFR = 0x0000;

    InitPieCtrl();                   //Initialize PIE


    // Disable CPU interrupts and clear all CPU interrupt flags:
       IER = 0x0000;
       IFR = 0x0000;

    InitPieVectTable();                //Initialize PIE interrupt vector table
  //  InitPeripherals();                //initialize peripherals
     InitGpio();                        //initialize GPIO
    InitXIntrupt();                    //Initialize external interrupt
    
    EALLOW;    
    
    PieVectTable.XINT1 = &ExtIntISR;
    
    EDIS;   
    
     XIntruptRegs.XINT1CR.bit.ENABLE = 1;            // Enable XINT1 pin
     XIntruptRegs.XINT1CR.bit.POLARITY = 1;          // Interrupt triggers on rising edge

    //*LedADDR=0xFF;
     // Enable the PIE block
     PieCtrl.PIECRTL.bit.ENPIE = 1;

     // Enable PIE group 1 interrupt 1-8

    //open the interrupt
    PieCtrl.PIEIER1.all = 0x0008;     //external interrupt 1 PIE group 1 where the first four
    // Make sure PIEACK for group 1 is clear (default after reset)
    PieCtrl.PIEACK.all = M_INT1;

    // Enable CPU INT1
    IER |= M_INT1;
    EINT;                           // Enable INTM
    ERTM;                            // Enable DBGM


    GpioDataRegs.GPADAT.all = 0x0000;
    Temp=0xFF;
    for(;;);
}     

interrupt void ExtIntISR(void)
{

    PieCtrl.PIEACK.all = 0xFFFF;
    PieCtrl.PIEIFR1.bit.INTx4 = 0;//0000 1101 0100 0111
    ERTM;
    EINT;
    Temp^=0xFF;
    GpioDataRegs.GPADAT.all = Temp;
}