Debug Module
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
31-23
31.4.1.5
BDM Command Set
summarizes the BDM command set. Subsequent sections contain detailed descriptions of
each command. Issuing a BDM command when the processor is accessing debug module registers using
the WDEBUG instruction causes undefined behavior. See
for register address encodings.
Table 31-20. BDM Command Summary
Command
Mnemonic
Description
CPU
State
1
1
General command effect and/or requirements on CPU operation:
- Halted: The CPU must be halted to perform this command.
- Steal: Command generates bus cycles that can be interleaved with bus accesses.
- Parallel: Command is executed in parallel with CPU activity.
Section/Page
Command
(Hex)
Read A/D
register
RAREG
/
RDREG
Read the selected address or data register and
return the results through the serial interface.
Halted
0x218 {A/D,
Reg[2:0]}
Write A/D
register
WAREG
/
WDREG
Write the data operand to the specified address or
data register.
Halted
0x208 {A/D,
Reg[2:0]}
Read
memory
location
READ
Read the data at the memory location specified by
the longword address.
Steal
0x1900—byte
0x1940—word
0x1980—lword
Write
memory
location
WRITE
Write the operand data to the memory location
specified by the longword address.
Steal
0x1800—byte
0x1840—word
0x1880—lword
Dump
memory
block
DUMP
Used with
READ
to dump large blocks of memory. An
initial
READ
executes to set up the starting address
of the block and to retrieve the first result. A
DUMP
command retrieves subsequent operands.
Steal
0x1D00—byte
0x1D40—word
0x1D80—lword
Fill memory
block
FILL
Used with
WRITE
to fill large blocks of memory. An
initial
WRITE
executes to set up the starting address
of the block and to supply the first operand. A
FILL
command writes subsequent operands.
Steal
0x1C00—byte
0x1C40—word
0x1C80—lword
Resume
execution
GO
The pipeline is flushed and refilled before resuming
instruction execution at the current PC.
Halted
0x0C00
No operation
NOP
Perform no operation; may be used as a null
command.
Parallel
0x0000
Output the
current PC
SYNC
_
PC
Capture the current PC and display it on the
PST/DDATA outputs.
Parallel
0x0001
Read control
register
RCREG
Read the system control register.
Halted
0x2980
Write control
register
WCREG
Write the operand data to the system control
register.
Halted
0x2880
Read debug
module
register
RDMREG
Read the debug module register.
Parallel
0x2D {0x4
2
DRc[4:0]}
Write debug
module
register
WDMREG
Write the operand data to the debug module
register.
Parallel
0x2C {0x4
DRc[4:0]}
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