Hello,
ESCI actually means enhanced SCI, so there should be no problems to operate as a normal SCI. I believe the enhancement actually refers to the optional ability to handle LIN protocol for automotive use, and the provision of a baud rate prescaler that allows fine adjustment of baud rate. There is also an "arbiter" facility for measurement of incoming bit period.
These additional facilities don't have to be used if you don't wish to.
Regards,
Mac