Timers perhaps?

[Doormatt]

Let's abstract for a sec.

I need two pins, call them A and B.

If Port A is pulsing at 4096Hz, then Port B needs to pulse at 1Hz. (In the real world, Port A needs to be a minimum of 245Khz)

But, I need to do this in the background.

Ideally, port A would be driven by the clock out, and port B would pulse once for every 4096 pulses coming out of the external clock.

Does that make more sense (sorry if I'm being confusing!)

-Matt