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SECTION 7
DEVELOPMENT SUPPORT
All M68000 Family members have the following special features that facilitate
applications development:
Trace on Instruction Execution -
All M68000 processors include an
instruction-by-instruction tracing facility to aid in program development. The
MC68020, MC68030, and CPU32 can also trace those instructions that
change program flow. In trace mode, an exception is generated after each
instruction is executed, allowing a debugger program to monitor execution of
a program under test. See 6.2.10 Tracing for more information.
Breakpoint Instruction -
An emulator can insert software breakpoints into
target code to indicate when a breakpoint occurs.
On the MC68010,
MC68020, MC68030, and CPU32, this function is provided via illegal
instructions ($4848-$484F) that serve as breakpoint instructions. See 6.2.5
Software Breakpoints for more information.
Unimplemented Instruction Emulation - When an attempt is made to execute
an illegal instruction, an illegal instruction exception occurs. Unimplemented
instructions (F-line, A-line) utilize separate exception vectors to permit
efficient emulation of unimplemented instructions in software.
See 6.2.8
Illegal or Unimplemented Instructions for more information.
7.1 CPU32 Integrated Development Support
In addition to standard MC68000 family capabilities, the CPU32 has features to
support advanced integrated system development.
These features include
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background debug mode, deterministic opcode tracking, hardware breakpoints, _ _
and internal visibility in a single-chip environment.
7.1.1 Background Debug Mode (BOM) Overview
Microprocessor systems generally provide a debugger, implemented in
software, for system analysis at the lowest level. The BDM on the CPU32 is
unique because the debugger is implemented in CPU microcode.
BDM incorporates a full set of debug options - registers can be viewed and/or
altered, memory can be read or written, and test features can be invoked.
CPU32 REFERENCE MANUAL
DEVELOPMENT SUPPORT
MOTOROLA
7-1
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