7.6.5 Applying Offsets to Bits within a Variable or Register

[rsocor01]

I don't understand the confusion.

Sayzer wants to know what happens if Y > 7. I don't know the answer to that either. For example,

Y = 8
Z = X.0[Y]
Z = ???

[Charles Linquis]

It depends on the position of the byte in memory, and is generally unpredictable. You can, however play some tricks with it.
If you assign vars like -

X var byte
Y var byte

Then PBP will assign the bytes to consecutive memory locations. In that case, bit 8 of X will be bit 0 of Y.

[sayzer]

Sayzer wants to know what happens if Y > 7. I don't know the answer to that either. For example,

Y = 8
Z = X.0[Y]
Z = ???

I was just referring to the question in the first post.
I already know that what happens might not be what you would like to get.