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serial data cannot be read...

hello,
im working on a project that reads serial data from RFID scanner......
Now the problem is the serial data is unable to be fetched.....
im using at89s52 microcontroller...
the instruction

MOV A,SBUF

doesnt copy the sbuf data to the accumulator for further processing...
the RI pin goes high on recieving data n its been cleared through programming.....
the only problem is the data is not been copied to accumulator.....

plz help....
thnku.....

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