Well, to be honest, I'm trying to get away using only the Axon clock for my application, however I'm unsure as to whether or not it's sufficient.
I am Using the Axon for datalogging inertial measurements, and sending those measurements back through the UART to a computer. For this, I need some pretty accurate time stamps to go with the measurements. I'm currently getting about a 70Hz measurement frequency, and I'm aiming to be able to run tests for at least one hour.
As for Interfacing a RTC to the Axon: I assume you read this much like you would read a sensor... Any suggestions. All the ones I can seem to find don't give me anything past seconds. Since I'm running at a pretty high frequency, I'd need something in the millisecond range.