/*
SLdt  251003          Disclaimer: none. Sue me.

ATtiny1616: Systemtakt auf 13.3 MHz fuer 3.3 V
  an Pin B0: 2.22 MHz (bei diesem Exemplar & 15 °C)
*/

#include "avr/io.h"

int main (void)
{
 _PROTECTED_WRITE(CLKCTRL.MCLKCTRLB,0x01);	// /2 (statt default /6)
 _PROTECTED_WRITE(CLKCTRL.OSC20MCALIBA,56);
	
VPORTB_DIR = 0b00000001;
while (1) {
  VPORTB_IN = 0b00000001;
}
}