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While workin with AT51RD2, we are facing a weird problem. The Code that is working well with AT89C51 doesnt wok with AT89C51RD2. we are not using any sfrs that are specifically used by RD2. It is a plain IO routine made in assembly. When we include the 89C51ix2.inc file it shows errors while compiling that, it shows the redefination error for the SFRs that are used in the 89c51 assembly routine. Can u tell us that in assembly how can eliminate the redfination error. thanx in advance