Hello Arvind,
Could you please describe your application?
In case you are trying to use the printf function with the FXTH87 device, I am afraid the sensor does not contain a dedicated serial data accelerator block.
Besides, it is not recommended because the printf function requires a lot of memory.
You can refer to the following tutorial in case it is useful for you:
Tutorial: Printf() with (and without) Processor Expert | MCU on Eclipse
I hope this information helps.
If I misunderstood your question, feel free to let me know. I will be glad to help.
Have a great day.
David Diaz.