My company is working a on a HART slave protocol stack for the Renesas M16C (16 bit) family.
The main benefits are:
-Hart v6 with burst mode
-implements RAM/ROM/EEPROM on chip
-low cost development platform (on chip debugger)
A later version will implement a HART software modem (under devellopment).
We have a evaluation version available that can be run on a M16C62P evaluation board. The package includes compiler/debugger/object code/sample c code. You don't need a HART modem, because this version connects directly to the serial port.
Visit our web site for more information: http://www.exalondelft.nl
Van Barenstraat 14
2628 LD Delft