After I messed up quite oddly the fuses in some atmega 328p (Murphy law) and I thought that I have fried these defenseless bloody microprocessors. I came across this posts :
and well…I plugged my function generator with its TTL output to the XTAL1 pin and send that all rounded 2Mhz square to the crystal pin.I ran some avrdude fuse readings and…it seems that they came back to life.
Man that was odd.
The most annoying being that I ordered 4 other atmegas from Tayda thinking that they were dead.