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Debug support (DBG)
Note:
It is highly recommended for the debugger host to connect (set a breakpoint in the reset
vector) under system reset.
31.12
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.
31.13
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
1064/1096
Doc ID 13902 Rev 12
RM0008
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