Analog Devices ADSP-BF535 Blackfin, Hardware Reference Manual

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Watchpoint Unit
20-2 ADSP-BF535 Blackfin Processor Hardware Reference
In addition, information that the Watchpoint Unit can provide helps
optimize code. The unit can also make it easier to maintain executables
through code patching.
The Watchpoint Unit contains these MMRs, which are accessible in
Supervisor and Emulator modes:
• The Watchpoint Status register (
WPSTAT
)
• Six Watchpoint Instruction Address registers (
WPIA[5:0]
)
• Six Watchpoint Instruction Address Count registers
(
WPIACNT[5:0]
)
• The Watchpoint Instruction Address Control register (
WPIACTL
)
• Two Watchpoint Data Address registers (
WPDA[1:0]
)
• Two Watchpoint Data Address Count registers (
WPDACNT[1:0]
)
• The Watchpoint Data Address Control register (
WPDACTL
)
Two operations implement instruction watchpoints:
• The values in the six Watchpoint Instruction Address registers,
WPIA[5:0]
, are compared to the address on the instruction bus.
• Corresponding count values in the Watchpoint Instruction
Address Count registers,
WPIACNT[5:0]
, are decremented on each
match.
The six Watchpoint Instruction 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
.