M5253EVBE Users Manual, Rev. 1
2-14
Freescale Semiconductor
To obtain help on the breakpoint command, the command is:
help br
2.4.16
LR (Loop Read)
Usage: LR <width> addr
The LR command continually reads the data at addr until a key is pressed. The optional <width> specifies
the size of the data to be read. If no <width> is specified, the command defaults to reading word sized data.
Example:
To continually read the longword data from address 0x2_0000, the command is:
lr.l 20000
2.4.17
LW (Loop Write)
Usage: LW <width> addr data
The LW command continually writes data to addr. The optional width specifies the size of the access to
memory. The default access size is a word.
Examples:
To continually write the longword data 0x1234_5678 to address 0x2_0000, the command is:
lw.l 20000 12345678
Note that the following command writes 0x78 into memory:
lw.b 20000 12345678
2.4.18
MD (Memory Display)
Usage: MD <width> <begin> <end>
The MD command displays a contiguous block of memory starting at address begin and stopping at
address end. The values for addresses begin and end may be absolute addresses specified as hexadecimal
values, or symbol names. Width modifies the size of the data that is displayed. If no <width> is specified,
the default of word sized data is used.
Memory display starts at the address begin. If no beginning address is provided, the MD command uses
the last address that was displayed. If no ending address is provided, then MD will display memory up to
an address that is 128 beyond the starting address.
This command first aligns the starting address for the data access size, and then increments the address
accordingly during the operation. Thus, for the duration of the operation, this command performs
properly-aligned memory accesses.
Examples:
To display memory at address 0x0040_0000, the command is:
md 400000