#include <xc.h> // include processor files
 
// Configuration bits for PIC16F877A
#pragma config FOSC = XT // Oscillator Selection
#pragma config WDTE = OFF // Watchdog Timer Enable
#pragma config PWRTE = ON // Power-up Timer Enable
#pragma config BOREN = ON // Brown-out Reset Enable
#pragma config LVP = OFF // Low-Voltage Programming Enable
#pragma config CPD = OFF // Data EEPROM Memory Code Protection
#pragma config WRT = OFF // Flash Program Memory Write Enable
#pragma config CP = OFF // Flash Program Memory Code Protection
 
#define _XTAL_FREQ 4000000 // Define system clock for delay functions
 
void main() {
    TRISB = 0x00; // Set PORTB as output
 
    while (1) {
        PORTB = 0xFF; // Turn on all LEDs on PORTB
        __delay_ms(500); // 500 ms delay
        PORTB = 0x00; // Turn off all LEDs
        __delay_ms(500); // 500 ms delay
    }
}
 

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