I want to use a 3.6864 MHz external oscillator to clock my ATMEGA328p to ensure 'error free' serial communication. When I looked at this page, I see that 3.68464MHz is also represented as 2*1.8432 MHZ.I'm at a loss as to what this means. Does this mean that I'd have to use two 1.8432 MHZ clocks to somehow generate 3.6864 MHz? Or does it just show me how this value (3.6864 MHz) came to be? If the former is true, how CAN I generate 3.6864MHz with two oscillators at a lower frequency? Are oscillators available at these 'multiple' rates of 1.8432MHz?
Will this communication will truly be error free as the page linked claims?
How would I connect the oscillator to the microcontroller? The datasheet confused me a bit because section 8.4 makes it seem that I place the oscillator between XTAL1 and XTAL2, while 8.8 suggests that I connect it to XTAL2 with XTAL1 not connected. So there's some confusion there, though 'm inclined to think that the latter is what I'm looking for. But, how can I connect the two pins of an oscillator to just the XTAL1 pin?