APB - Purpose of PADDR?


Please excuse me if this question is trivial as I am quite new to bus architecture.

What is the purpose of PADDR?

I understand that it is the APB address bus but could someone please give an example of what it would be used for? Would it only be for situations where you are reading or writing out of an addressable memory? What if you are using the APB to send data to something that is not addressable? Would you disregard PADDR completely? Am I thinking of this incorrectly?


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