XC8例子：MPLAB X 1.60, xc8, PIC16f690

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#include  <xc.h>

// CONFIG
#pragma config FOSC = INTRCCLK // Oscillator Selection bits (INTOSC oscillator: CLKOUT function on RA4/OSC2/CLKOUT pin, I/O function on RA5/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       // MCLR Pin Function Select bit (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 = OFF       // Internal External Switchover bit (Internal External Switchover mode is disabled)
#pragma config FCMEN = ON       // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)

#define _XTAL_FREQ 8000000  //required for _delay() function

void init(void){
    TRISA=0b00000000;   //PORTA is output
    PORTA=0b00000000;   //PORTA initially off

    //GIE=1;       //enable global interrupts
}

//system test function
void sys_test(void){
    unsigned char loopctr=0;    //loop counter
    for(loopctr=0; loopctr <=3; loopctr++){
        PORTA=0b00001111;   //turn on LEDs
        __delay_ms(500);
        PORTA=0b00000000;   //turn off LEDs
        __delay_ms(500);
    }
}

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