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Chapter 29
Debug Support
This chapter describes the Revision A enhanced hardware debug support in the MCF5282.
29.1 Overview
The debug module is shown in Figure 29-1.
Control
BKPT
Debug support is divided into three areas:
• Real-time trace support—The ability to determine the dynamic execution path
through an application is fundamental for debugging. The ColdFire solution
implements an 8-bit parallel output bus that reports processor execution status and
data to an external emulator system. See Section 29.3, "Real-Time Trace Support."
• Background debug mode (BDM)—Provides low-level debugging in the ColdFire
processor complex. In BDM, the processor complex is halted and a variety of
commands can be sent to the processor to access memory and registers. The external
emulator uses a three-pin, serial, full-duplex channel. See Section 29.5,
"Background Debug Mode (BDM)," and Section 29.4, "Programming Model."
• Real-time debug support—BDM requires the processor to be halted, which many
real-time embedded applications cannot do. Debug interrupts let real-time systems
execute a unique service routine that can quickly save the contents of key registers
and variables and return the system to normal operation. External development
MOTOROLA
ColdFire CPU Core
Debug Module
Trace Port
PST[3:0], DDATA[3:0]
CLKOUT
Figure 29-1. Processor/Debug Module Interface
Chapter 29. Debug Support
Communication Port
DSCLK, DSI, DSO
High-speed
local bus
29-1
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