S12S Debug Module (S12DBGV2)
MC9S12VRP Family Reference Manual Rev. 1.3
220
NXP Semiconductors
6.4.3.4
Channel Priorities
In case of simultaneous matches the priority is resolved according to
. The lower priority is
suppressed. It is thus possible to miss a lower priority match if it occurs simultaneously with a higher
priority. The priorities described in
dictate that in the case of simultaneous matches, the match
pointing to final state has highest priority followed by the lower channel number (0,1,2).
6.4.4
State Sequence Control
Figure 6-24. State Sequencer Diagram
The state sequencer allows a defined sequence of events to provide a trigger point for tracing of data in the
trace buffer. Once the DBG module has been armed by setting the ARM bit in the DBGC1 register, then
state1 of the state sequencer is entered. Further transitions between the states are then controlled by the
state control registers and channel matches. From Final State the only permitted transition is back to the
disarmed state0. Transition between any of the states 1 to 3 is not restricted. Each transition updates the
SSF[2:0] flags in DBGSR accordingly to indicate the current state.
Alternatively writing to the TRIG bit in DBGSC1, provides an immediate trigger independent of
comparator matches.
Independent of the state sequencer, each comparator channel can be individually configured to generate
an immediate breakpoint when a match occurs through the use of the BRK bits in the DBGxCTL registers.
Thus it is possible to generate an immediate breakpoint on selected channels, whilst a state sequencer
transition can be initiated by a match on other channels. If a debug session is ended by a match on a channel
the state sequencer transitions through Final State for a clock cycle to state0. This is independent of tracing
Table 6-36. Channel Priorities
Priority
Source
Action
Highest
TRIG
Enter Final State
Channel pointing to Final State
Transition to next state as defined by state control registers
Match0 (force or tag hit)
Transition to next state as defined by state control registers
Match1 (force or tag hit)
Transition to next state as defined by state control registers
Lowest
Match2 (force or tag hit)
Transition to next state as defined by state control registers
State1
Final State
State3
ARM = 1
Session Complete
(Disarm)
State2
State 0
(Disarmed)
ARM = 0
ARM = 0
ARM = 0
Содержание MC9S12VRP64
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Страница 92: ...Port Integration Module S12VRPPIMV1 MC9S12VRP Family Reference Manual Rev 1 3 92 NXP Semiconductors ...
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Страница 244: ...Interrupt Module S12SINTV1 MC9S12VRP Family Reference Manual Rev 1 3 244 NXP Semiconductors ...
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Страница 436: ...Supply Voltage Sensor BATSV2 MC9S12VRP Family Reference Manual Rev 1 3 436 NXP Semiconductors ...
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Страница 529: ...MC9S12VRP Family Reference Manual Rev 1 3 NXP Semiconductors 529 Appendix J Package Information ...
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