asynchrono mode operation

Hi all!!!! I’m trying to use the Atmega128 – Timer0 on your Asynchronous Mode Operation. What exactly I wanna do is count pulses using the TOSC1 or TOSC2 pin because I’m thrive to avoid external interruptions. Then a pulses source is connected to TOSC1 and I start to read the TCNT0. Unfortunately it’s not working as I expected regardless ASO bit is set. I know that the manufacture data sheet said that it’s not a good implementation but I would like to verify whether someone here has used it  likewise or not. If someone did, could you describe the steps to configure this mode? Thanks in advance!!!!

asynchrono mode operation

As this is an AVR question not a freertos question you would probably get a better answer from the avrfreaks forum.