PIC timer1

// PIC12F675
// 1Hz Time Base Osc.
// Timer1 Module
// 32.768 KHz
unsigned short tick;

void interrupt ()
{
        if (PIR1.TMR1IF)
        {
                TMR1H = 0xE0;
                PIR1.TMR1IF = 0;
                tick = 1;
        }
}

void Init ()
{
        TRISIO = 0;
        //Make all pins as output ports
        GPIO = 0;
        //Use Timer1 module
        INTCON.GIE = 1;
        INTCON.PEIE = 1;
        T1CON = 0x01;
        //Overflow every 8192
        TMR1H = 0xE0;
        TMR1L = 0x00;
        //  Enable TMR1 interrupt
        PIE1.TMR1IE = 1;
}

void main ()
{
        tick = 0;
        //Initialize Ports and Timer1 Module
        Init ();
        while (1)
        {
                if (tick)
                {
                        tick = 0;
                        GPIO = (1 << 0);
                }
                if (TMR1H > 0xF0)
                {
                        GPIO = 0;
                }
        }
}