M5249C3 Freescale Semiconductor, M5249C3 Datasheet - Page 17

• Manufacturer Part Number: M5249C3
• Description: KIT EVAL FOR M5249 W/ETHERNET
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®r
• Type: Microprocessorr

Specifications of M5249C3

• Contents: Module and Misc Hardware
• Processor To Be Evaluated: MCF5249
• Interface Type: RS-232, Ethernet
• For Use With/related Products: MCF5249
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Chapter 2
Using the Monitor/Debug Firmware
The M5249C3 single board computer has a resident firmware package that provides a self-contained
programming and operating environment. The firmware, named dBUG, provides the user with
monitor/debug interface, inline assembler and disassembly, program download, register and memory
manipulation, and I/O control functions. This chapter is a how-to-use description of the dBUG package,
including the user interface and command structure.
2.1
What Is dBUG?
dBUG is a traditional ROM monitor/debugger that offers a comfortable and intuitive command line
interface that can be used to download and execute code. It contains all the primary features needed in a
debugger to create a useful debugging environment.
dBUG is a resident firmware package for the ColdFire family single board computers. The firmware
(stored in one 1Mx16 Flash ROM device) provides a self-contained programming and operating
environment. dBUG interacts with the user through pre-defined commands that are entered via the
terminal. These commands are defined in Section 2.4, “Commands.”
The user interface to dBUG is the command line. A number of features have been implemented to achieve
an easy and intuitive command line interface.
dBUG assumes that an 80x24 character dumb-terminal is utilized to connect to the debugger. For serial
communications, dBUG requires eight data bits, no parity, and one stop bit, 8N1 with no flow control. The
default baud rate is 19200 but can be changed after the power-up.
The command line prompt is “dBUG> “. Any dBUG command may be entered from this prompt. dBUG
does not allow command lines to exceed 80 characters. Wherever possible, dBUG displays data in 80
columns or less. dBUG echoes each character as it is typed, eliminating the need for any “local echo” on
the terminal side.
In general, dBUG is not case sensitive. Commands may be entered either in upper or lower case,
depending upon the user’s equipment and preference. Only symbol names require that the exact case be
used.
Most commands can be recognized by using an abbreviated name. For instance, entering “h” is the same
as entering “help”. Thus, it is not necessary to type the entire command name.
The commands DI, GO, MD, STEP and TRACE are used repeatedly when debugging. dBUG recognizes
this and allows for repeated execution of these commands with minimal typing. After a command is
entered, simply press <RETURN> or <ENTER> to invoke the command again. The command is executed
as if no command line parameters were provided.
M5249C3 User’s Manual, Rev. 1
Freescale Semiconductor
2-1