mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 764

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 20 S12X Debug (S12XDBGV3) Module
Table 20-28
tagged operations since the trigger occurs based on the tagged opcode reaching the execution stage of the
instruction queue. Thus these bits are ignored if tagged triggering is selected.
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COMPE
Field
RWE
BRK
SRC
RW
4
3
2
1
0
shows the effect for RWE and RW on the comparison conditions. These bits are not useful for
Break — This bit controls whether a comparator match terminates a debug session immediately,
independent of state sequencer state. To generate an immediate breakpoint the module breakpoints must be
enabled using the DBGC1 bits DBGBRK[1:0].
0 The debug session termination is dependent upon the state sequencer and trigger conditions.
1 A match on this channel terminates the debug session immediately; breakpoints if active are generated,
Read/Write Comparator Value Bit — The RW bit controls whether read or write is used in compare for the
associated comparator. The RW bit is not used if RWE = 0.
0 Write cycle will be matched
1 Read cycle will be matched
Read/Write Enable Bit — The RWE bit controls whether read or write comparison is enabled for the
associated comparator. This bit is not useful for tagged operations.
0 Read/Write is not used in comparison
1 Read/Write is used in comparison
Determines mapping of comparator to S12XCPU or XGATE
0 The comparator is mapped to S12XCPU buses
1 The comparator is mapped to XGATE address and data buses
Determines if comparator is enabled
0 The comparator is not enabled
1 The comparator is enabled for state sequence triggers or tag generation
RWE Bit
tracing, if active, is terminated and the module disarmed.
0
0
1
1
1
1
Table 20-27. DBGXCTL Field Descriptions (continued)
Table 20-28. Read or Write Comparison Logic Table
RW Bit
x
x
0
0
1
1
MC9S12XDP512 Data Sheet, Rev. 2.17
RW Signal
0
1
0
1
0
1
Description
RW not used in comparison
RW not used in comparison
Write data bus
Read data bus
Comment
No match
No match
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