Source : Free On-Line Dictionary of Computing

Hitachi 6309
     
         (HD6309) {Hitachi}'s version of the {Motorola
        6809} {microprocessor}.  Compatible with the 6809, it added
        two new eight-bit {registers} that could be added to form a
        second 16-bit register, and all four eight-bit registers could
        form a 32-bit register.  It also featured division, and some
        32-bit arithmetic and was generally 30% faster in native mode.
        This information, surprisingly, was never published by
        Hitachi.
     
        {Technical reference
       
     (http://www.sandelman.ottawa.on.ca/People/Alan_DeKok/interests/6309.techref)}.
     
        (1997-03-21)