
Debug Module
Freescale Semiconductor
36-17
36.4
Functional Description
36.4.1
Background Debug Mode (BDM)
The ColdFire family implements a low-level system debugger in the microprocessor in a dedicated
hardware module. Communication with the development system is managed through a dedicated,
high-speed serial command interface. Although some BDM operations, such as CPU register accesses,
require the CPU to be halted, other BDM commands, such as memory accesses, can be executed while the
processor is running.
BDM is useful because:
•
In-circuit emulation is not needed, so physical and electrical characteristics of the system are not
affected.
•
BDM is always available for debugging the system and provides a communication link for
upgrading firmware in existing systems.
•
Provides high-speed cache downloading (500 Kbytes/sec), especially useful for flash
programming
•
Provides absolute control of the processor, and thus the system. This feature allows quick hardware
debugging with the same tool set used for firmware development.
36.4.1.1
CPU Halt
Although most BDM operations can occur in parallel with CPU operations, unrestricted BDM operation
requires the CPU to be halted. The sources that can cause the CPU to halt are listed below in order of
priority:
1. A catastrophic fault-on-fault condition automatically halts the processor.
2. A hardware breakpoint trigger can generate a pending halt condition similar to the assertion of
BKPT. This type of halt is always first marked as pending in the pocessor, which samples for
pending halt and interrupt conditions once per instruction. When a pending condition is asserted,
the processor halts execution at the next sample point. See
.
Table 36-16. Address, Access Size, and Operand Data Location
Address[1:0]
Access Size
Operand Location
00
Byte
D[31:24]
01
Byte
D[23:16]
10
Byte
D[15:8]
11
Byte
D[7:0]
0x
Word
D[31:16]
1x
Word
D[15:0]
xx
Longword
D[31:0]
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...