Thank you for clarifying what you meant. I'm sorry if bringing U1 and U2 into it has confused things.Anyway, I'm going by the D7000 manual, which I have downloaded in PDF format.The implementation of Auto ISO is the same as other Nikons like the D300 and D700 which I use. It is available in P, S, A and M Modes, not just P mode as you originally stated.
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