Motorola MCF5281 用户手册

MOTOROLA

Chapter 29.  Debug Support  

29-7

Debug control registers can be written by the external
development system or the CPU through the WDEBUG
instruction.

CSR is write-only from the programming model. It can be read
or written through the BDM port using the 

RDMREG

 and

WDMREG

 commands.

In the Revision A implementation of the debug module, certain hardware structures are
shared between BDM and breakpoint functionality as shown in Table 29-4.

Thus, loading a register to perform a specific function that shares hardware resources is
destructive to the shared function. For example, a BDM command to access memory
overwrites an address breakpoint in ABHR. A BDM write command overwrites the data
breakpoint in DBR.

0x00

Configuration/status register

CSR

0x00010_0000

0x01–0x05

Reserved

—

—

—

0x06

Address attribute trigger register 

AATR

0x0000_0005 

0x07

Trigger definition register

TDR

0x0000_0000

0x08

Program counter breakpoint register

PBR

—

0x09

Program counter breakpoint mask register

PBMR

—

0x0A–0x0B Reserved

—

—

—

0x0C

Address breakpoint high register

ABHR

—

0x0D

Address breakpoint low register

ABLR

—

0x0E

Data breakpoint register

DBR

—

0x0F

Data breakpoint mask register

DBMR

—

AATR

Bus attributes for all memory commands

Attributes for address breakpoint

ABHR

Address for all memory commands

Address for address breakpoint

DBR

Data for all BDM write commands

Data for data breakpoint