Z180 MMU Registers

I need help understanding and useing the Z180 MMU Register. I know that there are 3 registers that control the ability to use address lines A16 - A19. I have have read the information in the Z180 manual but it just isn't clear to me. Maybe if some one could give me an example like, well if you want use address line A18, you need to put ? in CBAR and ? in CBR and so on. Or maybe a short assembly program.

Thanks,

Dave Holt
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