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S12S Debug Module (S12DBGV2)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
229
requested immediately. TRIG breakpoints are possible with a single write to DBGC1, setting ARM and
TRIG simultaneously.
6.4.7.3
Breakpoint Priorities
If a TRIG trigger occurs after Begin aligned tracing has already started, then the TRIG no longer has an
effect. When the associated tracing session is complete, the breakpoint occurs. Similarly if a TRIG is
followed by a subsequent comparator channel match, it has no effect, since tracing has already started.
If a forced SWI breakpoint coincides with a BGND in user code with BDM enabled, then the BDM is
activated by the BGND and the breakpoint to SWI is suppressed.
6.4.7.3.1
DBG Breakpoint Priorities And BDM Interfacing
Breakpoint operation is dependent on the state of the BDM module. If the BDM module is active, the CPU
is executing out of BDM firmware, thus comparator matches and associated breakpoints are disabled. In
addition, while executing a BDM TRACE command, tagging into BDM is disabled. If BDM is not active,
the breakpoint gives priority to BDM requests over SWI requests if the breakpoint happens to coincide
with a SWI instruction in user code. On returning from BDM, the SWI from user code gets executed.
BDM cannot be entered from a breakpoint unless the ENABLE bit is set in the BDM. If entry to BDM via
a BGND instruction is attempted and the ENABLE bit in the BDM is cleared, the CPU actually executes
the BDM firmware code, checks the ENABLE and returns if ENABLE is not set. If not serviced by the
monitor then the breakpoint is re-asserted when the BDM returns to normal CPU flow.
If the comparator register contents coincide with the SWI/BDM vector address then an SWI in user code
could coincide with a DBG breakpoint. The CPU ensures that BDM requests have a higher priority than
SWI requests. Returning from the BDM/SWI service routine care must be taken to avoid a repeated
breakpoint at the same address.
Should a tagged or forced breakpoint coincide with a BGND in user code, then the instruction that follows
the BGND instruction is the first instruction executed when normal program execution resumes.
Table 6-43. Breakpoint Mapping Summary
DBGBRK
BDM Bit
(DBGC1[4])
BDM
Enabled
BDM
Active
Breakpoint
Mapping
0
X
X
X
No Breakpoint
1
0
X
0
Breakpoint to SWI
X
X
1
1
No Breakpoint
1
1
0
X
Breakpoint to SWI
1
1
1
0
Breakpoint to BDM
Summary of Contents for MC9S12VRP64
Page 16: ...MC9S12VRP Family Reference Manual Rev 1 3 16 NXP Semiconductors ...
Page 46: ...Device Overview S12VRP Series MC9S12VRP Family Reference Manual Rev 1 3 46 NXP Semiconductors ...
Page 236: ...S12S Debug Module S12DBGV2 MC9S12VRP Family Reference Manual Rev 1 3 236 NXP Semiconductors ...
Page 244: ...Interrupt Module S12SINTV1 MC9S12VRP Family Reference Manual Rev 1 3 244 NXP Semiconductors ...
Page 358: ...Timer Module TIM16B2CV3 MC9S12VRP Family Reference Manual Rev 1 3 358 NXP Semiconductors ...
Page 436: ...Supply Voltage Sensor BATSV2 MC9S12VRP Family Reference Manual Rev 1 3 436 NXP Semiconductors ...
Page 528: ...NVM Electrical Parameters MC9S12VRP Family Reference Manual Rev 1 3 528 NXP Semiconductors ...
Page 530: ...Package Information MC9S12VRP Family Reference Manual Rev 1 3 530 NXP Semiconductors ...
Page 531: ...Package Information MC9S12VRP Family Reference Manual Rev 1 3 NXP Semiconductors 531 ...
Page 532: ...Package Information MC9S12VRP Family Reference Manual Rev 1 3 532 NXP Semiconductors ...