We are designing a board, and a 32K clock source is already available on the board (it is needed elsewhere).
I would like to connect this clock source to the RTC, probably via TOSC1, although there is no explicit support for an external clock on this pin (as opposed to an external crystal). Target device is the ATxmega32A4 (only the 16-bit RTC, not the 32-bit, if that helps)
I'm guessing I will have to turn on the 32K xtal oscillator, but leave TOSC2 unconnected.
Has anyone used this strategy before?