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assembly language help

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sam08016

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Salam
can anybody tell me what is the meaning of

jb 'any bit of 8051',$

now what is the meaning of placing $ sign here.there should be a label,to which we want to jump after checking the bit but there is no such label in the code...

Thanks.....
 

jb means "jump if bit set"
$ means "same location where code rest in code memory
jb 'any bit of 8051',$
test the bit "any bit of 8051" if bit is set stay here else next statement
 

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