RM0440 Rev 4 2095/2126
RM0440 Debug support (DBG)
2112
Note: It is highly recommended for the debugger host to connect (set a breakpoint in the reset
vector) under system reset.
47.12 FPB (Flash patch breakpoint)
The FPB unit:
• implements hardware breakpoints
• patches code and data from code space to system space. This feature gives the
possibility to correct software bugs located in the Code Memory Space.
The use of a Software Patch or a Hardware Breakpoint is exclusive.
The FPB consists of:
• 2 literal comparators for matching against literal loads from Code Space and remapping
to a corresponding area in the System Space
• 6 instruction comparators for matching against instruction fetches from Code Space.
They can be used either to remap to a corresponding area in the System Space or to
generate a Breakpoint Instruction to the core.
47.13 DWT (data watchpoint trigger)
The DWT unit consists of four comparators. They are configurable as:
• a hardware watchpoint or
• a trigger to an ETM or
• a PC sampler or
• a data address sampler
The DWT also provides some means to give some profiling informations. For this, some
counters are accessible to give the number of:
• Clock cycle
• Folded instructions
• Load store unit (LSU) operations
• Sleep cycles
• CPI (clock per instructions)
• Interrupt overhead
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