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System Debug

Unrestricted Access Non-Confidential

• Data value is only sampled for accesses that do not fault (MPU or bus fault). The

PC is sampled irrespective of any faults. The PC is only sampled for the first

address of a burst.

• FUNCTION is overridden for comparators given by DATAVADDR0 and

DATAVADDR1 in DWT_FUNCTION1if DATAVMATCH is also set in

DWT_FUNCTION1. The comparators given by DATAVADDR0 and

DATAVADDR1 can then only perform address comparator matches for

comparator 1 data matches.

• If the data matching functionality is not included during implementation it is not

possible to set DATAVADDR0, DATAVADDR1, or DATAVMATCH in

DWT_FUNCTION1. This means that the data matching functionality is not

available in the implementation. Test the availability of data matching by writing

and reading the DATAVMATCH bit in DWT_FUNCTION1. If it is not settable

then data matching is unavailable.

• PC match is not recommended for watchpoints because it stops after the

instruction. It mainly guards and triggers the ETM.

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ARM Cortex-M3 Specifications

General

Architecture	ARMv7-M
Instruction Set	Thumb-2
Pipeline Stages	3-stage
Interrupts	Nested Vectored Interrupt Controller (NVIC)
Interrupt Controller	Nested Vectored Interrupt Controller (NVIC)
Memory Protection Unit	Optional
Power Consumption	Varies by implementation
Max Clock Speed	Up to 100 MHz
Debugging	JTAG and Serial Wire Debug (SWD)
Operating Voltage	1.8V to 3.6V
Manufacturing Process	Varies by implementation
Core Type	32-bit