#include "avr/io.h"

int main (void)
{
	
 _PROTECTED_WRITE(CLKCTRL.MCLKCTRLB,0x01);	// /2 (statt default /6)
//  CCP = CCP_IOREG_gc;
//  CLKCTRL.MCLKCTRLB = CLKCTRL_PEN_bm;
	
VPORTB_DIR = 0b00000001;
while (1) {
  VPORTB_IN = 0b00000001;
}
}