I'm sure you can find the Enhanced UART in other manufacturers 8051, but I only use Philips 8051 Microprocessors.

You can read about the feature at:
http://www.semiconductors.com/pip/P87C52EBAA

or look at a pdf file at:
http://www.semiconductors.com/acrobat/d...51RX_5.pdf

Look on page 19 of that pdf file.
=================================

The Philips models with the enhanced UARTs are:

87C754/83C754
87C51/80C51/80C31
89C52/87C52/80C52/80C32
87C51FA/83C51FA/80C51FA
89C51RA+/87C51RA+
87C575/83C575/80C575
87C576/83C576/80C576
87C453/83C453/80C453
89C54/87C54/80C54
87C51FB/83C51FB
89C51RB+/87C51RB+/83C51RB+
89C58/87C58/80C58
87C51FC/83C51FC
89C51RC+/87C51RC+/83C51RC+
83CE598/80CE598
89C51RD+/87C51RD+/83C51RD+


Good luck,
-Jay C. Box