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Chapter 18 Version 1 ColdFire Debug (CF1_DEBUG)
MCF51QE128 MCU Series Reference Manual, Rev. 3
390 Freescale Semiconductor
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18.4.1.5 BDM Command Set Summary
Table 18-25 summarizes the BDM command set. Subsequent paragraphs contain detailed descriptions of
each command. The nomenclature below is used in Table 18-25 to describe the structure of the BDM
commands.
Commands begin with an 8-bit hexadecimal command code in the host-to-target direction (most
significant bit first)
/ = separates parts of the command
d = delay 16 target BDC clock cycles
ad24 = 24-bit memory address in the host-to-target direction
rd8 = 8 bits of read data in the target-to-host direction
rd16 = 16 bits of read data in the target-to-host direction
rd32 = 32 bits of read data in the target-to-host direction
rd.sz = read data, size defined by sz, in the target-to-host direction
wd8 = 8 bits of write data in the host-to-target direction
wd16 = 16 bits of write data in the host-to-target direction
wd32 = 32 bits of write data in the host-to-target direction
wd.sz = write data, size defined by sz, in the host-to-target direction
ss = the contents of XCSR[31:24] in the target-to-host direction (STATUS)
sz = memory operand size (0b00 = byte, 0b01 = word, 0b10 = long)
crn = core register number
WS = command suffix signaling the operation is “with status”
Table 18-25. BDM Command Summary
Command
Mnemonic
Command
Classification
ACK
if Enb?
1
Command
Structure
Description
SYNC Always
Available
N/A N/A
2
Request a timed reference pulse to
determine the target BDC communication
speed
ACK_DISABLE Always
Available
No 0x03/d Disable the communication handshake.
This command does not issue an ACK
pulse.
ACK_ENABLE Always
Available
Yes 0x02/d Enable the communication handshake.
Issues an ACK pulse after the command is
executed.
BACKGROUND Non-Intrusive Yes 0x04/d Halt the CPU if ENBDM is set. Otherwise,
ignore as illegal command.
DUMP_MEM.sz Non-Intrusive Yes (0x32+4 x sz)/d/rd.sz Dump (read) memory based on operand
size (sz). Used with READ_MEM to dump
large blocks of memory. An initial
READ_MEM is executed to set up the
starting address of the block and to retrieve
the first result. Subsequent DUMP_MEM
commands retrieve sequential operands.