I need to sync up to a 2.048 MHz clock, but this is faster than my instruction cycle clock (I am not tied to a specific crystal frequency, but it needs to be less than 20 MHz to preserve battery life).

Can anyone help with a novel way to do this (some obscure timer mode, etc.)? Or is the best method simply to select a crystal frequency that allows the instruction frequency to be a "neat" fraction of 2.048 MHz (e.g. crystal frequency=12.288 MHz -> instruction frequency=1.024 MHz).

Regards.
Drew Rainwater