M5253EVBE Users Manual, Rev. 1
Freescale Semiconductor
1-7
1.6.4
Selecting Terminal Baud Rate
The serial channel UART0 of the MCF5253 is used for serial communication and has a built in timer. This
timer is used by the dBUG ROM monitor to generate the baud rate used to communicate with a serial
terminal. A number of baud rates can be programmed. On power-up or manual RESET, the dBUG ROM
monitor firmware configures the channel for 115200 baud. Once the dBUG ROM monitor is running, a
SET command may be issued to select any baud rate supported by the ROM monitor. See
Section 2.1,
“What Is dBUG?
” for the discussion of this command.
1.6.5
Terminal Character Format
The character format of the communication channel is fixed at power-up or RESET. The default character
format is 8 bits per character, no parity and one stop bit with no flow control. It is necessary to ensure that
the terminal or PC is set to this format.
1.6.6
Connecting the Terminal
The board is now ready to be connected to a PC/terminal. Use the RS232 serial cable to connect the
PC/terminal to the M5253EVBE PCB. The cable has a 9-pin female D-sub terminal connector at one end
and a 9-pin male D-sub connector at the other end. Connect the 9-pin male connector to connector P4 on
the M5253EVBE board. Connect the 9-pin female connector to one of the available serial communication
channels normally referred to as COM1 (COM2, etc.) on the PC running terminal emulation software. The
connector on the PC/terminal may be either male 25-pin or 9-pin. It may be necessary to obtain a
25pin-to-9pin adapter to make this connection. If an adapter is required, refer to
Figure 1-3
, which shows
the pin assignment for the 9-pin connector on the board.
Figure 1-3 Pin Assignment for Female (Terminal) Connector
1.6.7
Using a Personal Computer as a Terminal
A personal computer may be used as a terminal provided a terminal emulation software package is
available. Examples of this software are PROCOMM, KERMIT, QMODEM, Windows 95/98/2000/XP
Hyper Terminal or similar packages. The board should then be connected as described in
Section 1.6.6,
“Connecting the Terminal
.”
Table 1-1 Power Supply Connections on P2
Contact Number
Voltage
1
+7 V to +14 V DC
2
Ground
1
6
9
5