PIC Lチカができない

###前提・実現したいこと
PICkit3とPIC16F887を使ってLチカをしたいのですが、
プログラムを書き込んでも、うまくいきません。
ご教授お願いします。

###発生している問題・エラーメッセージ
LEDが点かない

###該当のソースコード

 * File:   main.c
 * Author: ***
 *
 * Created on 2016/09/09, 17:17
 */

#include <stdio.h>
#include <stdlib.h>
#include <xc.h>

// PIC16F887 Configuration Bit Settings

// 'C' source line config statements

// CONFIG1
#pragma config FOSC = EXTRC_CLKOUT// Oscillator Selection bits (RC oscillator: CLKOUT function on RA6/OSC2/CLKOUT pin, RC on RA7/OSC1/CLKIN)
#pragma config WDTE = ON        // Watchdog Timer Enable bit (WDT enabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config MCLRE = ON       // RE3/MCLR pin function select bit (RE3/MCLR pin function is MCLR)
#pragma config CP = OFF         // Code Protection bit (Program memory code protection is disabled)
#pragma config CPD = OFF        // Data Code Protection bit (Data memory code protection is disabled)
#pragma config BOREN = ON       // Brown Out Reset Selection bits (BOR enabled)
#pragma config IESO = ON        // Internal External Switchover bit (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON       // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)
#pragma config LVP = OFF        // Low Voltage Programming Enable bit (RB3 pin has digital I/O, HV on MCLR must be used for programming)

// CONFIG2
#pragma config BOR4V = BOR40V   // Brown-out Reset Selection bit (Brown-out Reset set to 4.0V)
#pragma config WRT = OFF        // Flash Program Memory Self Write Enable bits (Write protection off)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#define XTAL_FREQ 4000000

/*
 * 
 */
int main(int argc, char** argv) 
{
    TRISD = 0; //RDをOUTPUTに
    char st=0;
    while(1);
    {
        if(st==0)
        {
            PORTDbits.RD1 = 0;
            //PORTD = 0;
            st = 1;
        }
        else
        {
            PORTDbits.RD1 = 1;
            //PORTD = 0x02;
            st = 0;
        }
        _delay(2000000);
    }
}