My project is starting

[ScaleRobotics]

Now its time to step up the function here. I want to move the port passing to the int. But I am having a brain fart about the timming. The pulses last for 10uS high and 10uS low. I am thinking a 5uS interupt will ensure I NEVER miss a pulse, but my mind is cloudy on this. My int will be ASM, so no PBP context saving for entry and exit. I want to do this so I can do more stuff and never worry about missing a step.

You could do an interrupt on change of state for portA,

RAC_INT -- RA Port Change

Then have your interrupt routine look to see which bit has changed state.
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[cncmachineguy]

Don't I need to do that on a port with IOC? Port B seems to be my IOC port, but since B has ICSP pins, I left them dedicated to ICSP. I need all 8 pins for my control.