Motorola ColdFire MCF5281 - Manual (Page 638)

Debug Support
30-20 Freescale Semiconductor
Unassigned command opcodes are reserved by Freescale. All unused command formats within any
revision level perform a
NOP and return the illegal command response.
30.5.3.1 ColdFire BDM Command Format
All ColdFire Family BDM commands include a 16-bit operation word followed by an optional set of one
or more extension words, as shown in
Figure 30-15 .
Table 30-17. 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
Command
(Hex)
Read A/D
register RAREG /
RDREG
Read the selected address or data register and
return the results through the serial interface. Halted 30.5.3.3.1 0x218 {A/D,
Reg[2:0]}
Write A/D
register WAREG /
WDREG
Write the data operand to the specified address or
data register. Halted 30.5.3.3.2 0x208 {A/D,
Reg[2:0]}
Read
memory
location READ Read the data at the memory location specified by
the longword address. Steal 30.5.3.3.3 0x1900—byte
0x1940—word
0x1980—longword
Write
memory
location WRITE Write the operand data to the memory location
specified by the longword address. Steal 30.5.3.3.4 0x1800—byte
0x1840—word
0x1880—longword
Dump
memory
block DUMP Used with READ to dump large blocks of memory. An
initial READ is executed to set up the starting address
of the block and to retrieve the first result. A DUMP
command retrieves subsequent operands.
Steal 30.5.3.3.5 0x1D00—byte
0x1D40—word
0x1D80—longword
Fill memory
block FILL Used with WRITE to fill large blocks of memory. An
initial WRITE is executed to set up the starting
address of the block and to supply the first operand.
A
FILL command writes subsequent operands.
Steal 30.5.3.3.6 0x1C00—byte
0x1C40—word
0x1C80—longword
Resume
execution GO The pipeline is flushed and refilled before resuming
instruction execution at the current PC. Halted 30.5.3.3.7 0x0C00
No operation NOP Perform no operation; may be used as a null
command. Parallel 30.5.3.3.8 0x0000
Read control
register RCREG Read the system control register. Halted 30.5.3.3.9 0x2980
Write control
register WCREG Write the operand data to the system control
register. Halted 30.5.3.3.10 0x2880
Read debug
module
register RDMREG Read the debug module register. Parallel 30.5.3.3.11 0x2D {0x4
2
DRc[4:0]}
2
0x4 is a three-bit field.
Write debug
module
register WDMREG Write the operand data to the debug module
register. Parallel 30.5.3.3.12 0x2C {0x4 2
DRc[4:0]}
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3