Notes on using the HCS12 SCI (UART).
====================================
By Colin D. Bennett, 6 May 2008.

(1) The DB-9 D-sub connectors on the Dragon12-Plus are set up as a DCE port, 
so it will use a straight-through serial cable to connect to your PC, but you
will need a loopback (a.k.a. null modem) RS-232 cable to connect the Dragon
board to another piece of DCE equipment such as most peripherals.

(2) You must not use hardware flow control on your PC when communicating with
the HCS12 on the Dragon12-Plus. I spent a couple of days examining the
contents of CPU registers, wading through assembly language code dumps, and
trying a myriad of things before I discovered that all I had to do was turn
off the (RTS/CTS) hardware flow control on my workstation's serial port!


