Well this is for the inverting amp between the XTAL1/2 pins, and the crystal is in the feedback path. But in the datasheet, I don't see any warning, or note saying what happens if you were to use OUT to send full byte in a REG, to the DDRB or PORTB in this case.
Of the other PortB pins, I'm only using 1 of them, so I shouldn't have to worry about those DDRB, PORTB bits. But in other chips, I may want to use OUT, and then would I set those bits to 0 or 1 ?
IDK, I'm about to solder up the crystal, so I'll try a little program and see what happens. I also want to see how long it takes the OSC to stabilize.
I had wanted to use a deep-sleep state, and wake-up in a few cycles like from the internal OSC. But to my dismay, if the EXT OSC it restarted, it takes at least 258cycles to wakeup, and then they recommend a stabilization time of mili-seconds.