ARM Cortex-M3 - Table 11-14 DWT Program Counter Sample Register Bit Assignments; Table 11-15 DWT Comparator Registers 0-3 Bit Assignments

System Debug
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DWT Program Counter Sample Register
Use the DWT Program Counter Sample Register (PCSR) to enable coarse-grained
software profiling using a debug agent, without changing the currently executing code.
If the core is not in debug state, the value returned is the instruction address of a recently
executed instruction.
If the core is in debug state, the value returned is
0xFFFFFFFF .
The register address, access type, and Reset state are:
Address
0xE000101C
Access Read-only
Reset state Unpredictable
DWT Program Counter Sample Register bit assignments describes the field of the DWT
PCSR.
DWT Comparator Registers
Use the DWT Comparator Registers 0-3 to write the values that trigger watchpoint
events.
The register address, access type, and Reset state are:
Address
0xE0001020 , 0xE0001030 , 0xE0001040 , 0xE0001050
Access Read/write
Reset state -
Table 11-15 describes the field of DWT Comparator Registers 0-3.
Table 11-14 DWT Program Counter Sample Register bit assignments
Bits Field Function
[31:0] EIASAMPLE Execution instruction address sample, or
0xFFFFFFFF if the core is halted.
Table 11-15 DWT Comparator Registers 0-3 bit assignments
Field Name Definition
[31:0] COMP Data value to compare against PC and the data address as given by DWT_FUNCTIONx.
DWT_COMP0 can also compare against the value of the PC Sampler Counter (DWT_CYCCNT).
DWT_COMP1 can also compare against data values so that data matching can be performed
(DATAVMATCH).