int main(void)
{
    cli();

    OSC_XOSCCTRL = OSC_FRQRANGE_12TO16_gc |
                   OSC_XOSCSEL_EXTCLK_gc;
    OSC_CTRL = OSC_XOSCEN_bm;
    while(!(OSC_STATUS & OSC_XOSCRDY_bm)) {; }

    CPU_CCP = CCP_IOREG_gc;
    CLK_CTRL = CLK_SCLKSEL_XOSC_gc;
    OSC_CTRL &= 0xFE;

    EVSYS_CH0MUX = EVSYS_CHMUX_PRESCALER_1_gc;      // ClkPER div by 2^0 is event source
    PORTCFG_CLKEVOUT = PORTCFG_EVOUT_PE7_gc;        // Event Channel 7 Output on Port E pin 7
                                                    //  PORTCFG_CLKOUT_PE7_gc = (0x03<<0)

    PORTA_DIR = 0b00000000;
    PORTB_DIR = 0b11111111;
    PORTC_DIR = 0b00000000;
    PORTD_DIR = 0b00000000;
    PORTE_DIR = 0b10000000;             // PE7 must be configured as output for the event to be available on the pin
    PORTF_DIR = 0b00000000;
    PORTH_DIR = 0b00000000;
    PORTJ_DIR = 0b00011000;
    PORTK_DIR = 0b00000000;
    PORTQ_DIR = 0b0000;

    while (1)
    {
        asm ("nop");
    }
}