mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1285

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

the ColdFire background debug logic, the real-time debug hardware, and the PST/
DDATA trace logic. This interface provides a convenient means for programming the on-
chip flash and othernon-volatile memories. The BDC is the primary debug interface for
development and allows non-intrusive access to memory data and traditional debug
features such as run/halt control, read/write of core registers, breakpoints, and single
instruction step.
Features of the background debug controller (BDC) include:
Based on these features, BDM is useful for the following reasons:
50.4.1.1 CPU Halt
Although certain 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. Recall that the default configuration of the Version 1
ColdFire core (CF1Core) defines the occurrence of certain exception types to
Freescale Semiconductor, Inc.
• Single dedicated pin for mode selection and background communications
• Special BDC registers not located in system memory map
• SYNC command to determine target communications rate
• Non-intrusive commands for memory access
• Active background (halt) mode commands for core register access
• GO command to resume execution
• BACKGROUND command to halt core or wake CPU from low-power modes
• Oscillator runs in stop mode, if BDM enabled
• In-circuit emulation is not needed, so physical and electrical characteristics of the
• BDM is always available for debugging the system and provides a communication
• Provides high-speed memory downloading, especially useful for flash programming
• Provides absolute control of the processor, and thus the system. This feature allows
system are not affected.
link for upgrading firmware in existing systems.
quick hardware debugging with the same tool set used for firmware development.
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Chapter 50 Debug
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