Analog Devices ADSP-BF53x Blackfin, Reference

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Watchpoint Unit
21-2 ADSP-BF53x/BF56x Blackfin Processor Programming Reference
In addition, information that the Watchpoint Unit provides helps in the
optimization of code. The unit also makes it easier to maintain executables
through code patching.
The Watchpoint Unit contains these memory-mapped registers (MMRs),
which are accessible in Supervisor and Emulator modes:
• The Watchpoint Status register (
WPSTAT
)
• Six Instruction Watchpoint Address registers (
WPIA[5:0]
)
• Six Instruction Watchpoint Address Count registers
(
WPIACNT[5:0]
)
• The Instruction Watchpoint Address Control register (
WPIACTL
)
• Two Data Watchpoint Address registers (
WPDA[1:0]
)
• Two Data Watchpoint Address Count registers (
WPDACNT[1:0]
)
• The Data Watchpoint Address Control register (
WPDACTL
)
Two operations implement instruction watchpoints:
• The values in the six Instruction Watchpoint Address registers,
WPIA[5:0]
, are compared to the address on the instruction bus.
• Corresponding count values in the Instruction Watchpoint
Address Count registers,
WPIACNT[5:0]
, are decremented on each
match.
The six Instruction Watchpoint Address registers may be further grouped
into three ranges of instruction-address-range watchpoints. The ranges are
identified by the addresses in
WPIA0
to
WPIA1
,
WPIA2
to
WPIA3,
and
WPIA4
to
WPIA5
.