PIC16F884 interner Oszillator

#pragma config FOSC = HS // Oscillator Selection bits (INTOSC oscillator: CLKOUT function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN)

#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled and can be enabled by SWDTEN bit of the WDTCON register)

#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 = ON         // Low Voltage Programming Enable bit (RB3/PGM pin has PGM function, low voltage programming enabled)

// 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

#include <xc.h>

// #pragma config statements should precede project file includes.

// Use project enums instead of #define for ON and OFF.

#include <xc.h>

int main()

{

  TRISA1 = 0;

  while(1)

  {

    RA1 = 1;

    __delay_ms(1000);

    RA1 = 0;

    __delay_ms(1000);

  }

  return 0;

}