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about serial communication

this is manoj im using 89c52 microcontroller .im unable to transmit the data serilally for 115200 baud rate .
but im able to transmit thro 9600 baud rate configuration.

i tried using X2 mode by configuring
baud rate control register
baud reload register
pcon register
clock control register

can anyone give the example for configuring the registers in x2 mode for baud rate of 115200