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i just wanted to knw the meaning of v and rd2 in p89v51rd2 ic
The datasheet tells you what the chip does!
The datasheet might also give you a description of the numbering scheme, or you may be able to find a description on the NXP website - if you're really interested.
Note that this has nothing at all to do with Keil - it is entirely a matter of NXP's numbering scheme