Development Capabilities and Interface
20-10
MPC823e REFERENCE MANUAL
MOTOROLA
DEVELOPMENT
20
CAPABILITIES & INTERFACE
Greater-than-or-equal-to and less-than-or-equal-to are easily obtained from these four
conditions. Refer to
Section 20.3.1.5 Generating Compare Types
for more information.
Using the AND-OR logic structures “in range” and “out of range”, detections of address and
data comparators are supported. Using the counters, you can program a breakpoint to be
recognized after an event has been detected after a predefined number of times.
The L-data comparators operate on load or store fixed-point data. When operating on
fixed-point data, the L-data comparators perform a comparison on bytes, half-words, and
words. They treat numbers as either signed or unsigned values. The comparators generate
match events and then instruction match events enter the instruction AND-OR logic where
the instruction watchpoints and breakpoint are generated. The asserted instruction
watchpoints can generate the instruction breakpoint. Two different events can decrement
one of the counters. When a counter on one of the instruction watchpoints expires, the
instruction breakpoint is asserted.
Figure 20-1. Watchpoint and Breakpoint Support in the Core
INTERNAL
PERIPHERALS
X
X
X
X
DEVELOPMENT
SYSTEM OR
EXTERNAL
PERIPHERALS
DEVELOPMENT
PORT
LCTRL2
MSR
INTERNAL
WATCHPOINTS
LOGIC
WATCHPOINTS
MSR
RI
NONMASKED CONTROL BIT
SOFTWARE TRAP ENABLE BITS
DEVELOPMENT PORT TRAP ENABLE BITS
NONMASKABLE BREAKPOINT
MASKABLE BREAKPOINT
CPM
µ
CODE
DEVELOPMENT
ACCESSIBLE
BIT WISE AND
BIT WISE OR
COUNTERS
BREAKPOINT
TO CPU
TO
WATCHPOINT
PINS
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