This is probably a basic question for most of you but I can't quite figure it out. I have a register that needs to be set, lets say INEEDSLEEP. The addresses are 80h, 90h, 100h. My questions are:

1. If the data sheet says it's bits <3:0>, why are there only three addresses when it covers four bits?

2. Do you put the exact same values into all of the addresses?

When I've used more basic registers, I just use something like INEEDSLEEP = %00010100. Maybe I just never noticed it but I don't remember ever having to put values into three different addresses for one value.

I'll start with this and see if someone can get it through my thick skull.