Externer Interrupt PIC32

#include <stdio.h>

#include <stdlib.h>

#include <plib.h>

#pragma config FPLLMUL = MUL_20, FPLLIDIV = DIV_4, FPLLODIV = DIV_2, FWDTEN = OFF

#pragma config POSCMOD = HS, FNOSC = PRIPLL, FPBDIV = DIV_2

#define SYS_FREQ (50000000L) 

int main(int argc, char** argv) {

    TRISGbits.TRISG8 = 1;           //INT3-Pin als Eingang

    TRISDbits.TRISD0 = 0;

    //Externes Interrupt

    INTCONbits.INT3EP = 1;          //auf steigende Flanke reagieren

    INT3Rbits.INT3R = 0b0001;       //RPG8 als Int Pin

    IFS0bits.INT3IF = 0;            //Flag löschen

    IPC3bits.INT3IP = 3;            //Priorität festlegen

    IEC0bits.INT3IE = 1;            //Interrupt aktivieren

    INTEnableSystemMultiVectoredInt();   //Interrupts global zulassen

    while(1){

    }

    return (EXIT_SUCCESS);

}

    void __ISR(_EXTERNAL_3_VECTOR, ipl3) External3Handler(void){

        LATDbits.LATD0 = 1;

        IFS0bits.INT3IF = 0;     //Flag löschen

    }