How to set the second bit of the register in this setting?

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flycracker

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a question in iterview
A Small coupter has 8-bit CPU and only one register,XOR is only assebly command it understands.How to set the second bit of the register?the initial state of the register is unknow.
 

Re: HELP!!

reg⊕$00>reg
reg⊕$02>reg
result : xxxxxx1x

reg⊕$FF>reg
reg⊕$FD>reg
result : xxxxxx1x

If one of two men, one always speaks truth and other always lies, how would you get right answer if you don't know which one is which?

https://en.wikipedia.org/wiki/XOR

 

HELP!!

reg⊕$00>reg
what does it mean??
 

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