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TX is not giving expected data.

Hi all,
i am using silicon labs controller 8051F340 in which the TX of serial port is not giving expected data(acknowledgment for received data). instead it is giving some other data. It is happening only in one particular board (other boards are fine)
frame: 55 xx xx xx xx xx xx xx xx xx AA frame sent
frame expected: 61(01 is appearing).

i have doubt that the register settings of that particular ctrller has been corrupted please give suggestions to make it proper without changing controller.

Thank You