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Initializing the
Clock Speed
Loading User
Software
Initializing Memory
MMDS0508OM/D
MOTOROLA
Freescale Semiconductor, Inc.
The MMDS platform board can supply an oscillator clock source for the
MCU's OSC1 input. Clock control is available via the OSC command.
Note that many EMs require a specific jumper configuration so that this
clock source can be used. Refer to the specific EM user's manual for EM
clock source information.
For the MMDS05, five clock frequencies are available: four internally
generated clock frequencies, 8 MHz, 4 MHz, 2 MHz, and 1 MHz and an
external clock source. The external clock source should be supplied via
the white logic clip of pod A. Entering the emulator clock (OSC)
command without the designated frequency brings up the temporary
MMDS emulator clock frequency window near the center of the debug
screen.
For the MMDS08, six clock frequencies are available: five internally
generated clock frequencies, 16 MHz, 8 MHz, 4 MHz, 2 MHz, and 1
MHz, and an external clock source.
Software for the target system must be available on the host computer
in S-record format. Use the LOAD command to load an S-record file into
the emulator and the accompanying map (symbol) file into the host
computer. The assembler shipped with the MMDS (CASM) has the
ability to generate a current map each time an assembly program is
assembled.
The specific S-record to load can be specified on the command line by
typing the S-record filename after the LOAD command. If the file has the
extension.S19, then the extension can be omitted. Alternatively, if no
filename is specified, then a search window appears, displaying the files
with a.S19 extension in the current directory.
During a debugging session, specific memory locations should contain
known values. The required values are stored in memory as numeric
values or as instructions assembled individually. The commands that
store and manipulate the contents of memory are described in the
following paragraphs.
Operation Fundamentals
For More Information On This Product,
Go to: www.freescale.com
Operation Fundamentals
System Initialization
63
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