PC912XDP512F0MPVR datasheet(771/1348 Pages) FREESCALE

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Chapter 20 S12X Debug (S12XDBGV3) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

773

execution stage of the instruction queue a transition to the disarmed state0 occurs, ending the debug session

and generating a breakpoint, if breakpoints are enabled. External tagging is only possible in device

emulation modes.

20.4.3.4

Trigger On XGATE S/W Breakpoint Request

The XGATE S/W breakpoint request issues a forced breakpoint request to the S12XCPU immediately

independent of S12XDBG settings and triggers the state sequencer into the disarmed state. Active tracing

sessions are terminated immediately, thus if tracing has not yet begun, no trace information is stored.

XGATE generated breakpoints are independent of the DBGBRK bits. The XGSBPE bit in DBGC1

determines if the XGATE S/W breakpoint function is enabled. The BDM bit in DBGC1 determines if the

XGATE requested breakpoint causes the system to enter BDM Mode or initiate a software interrupt (SWI).

20.4.3.5

Immediate Trigger

Independent of comparator matches or external tag signals it is possible to initiate a tracing session and/or

breakpoint by writing to the TRIG bit in DBGC1. This triggers the state sequencer into the Final State and

issues a forced breakpoint request to both S12XCPU and XGATE.

20.4.3.6

Trigger Priorities

In case of simultaneous triggers, the priority is resolved according to Table 20-38. The lower priority

trigger is suppressed. It is thus possible to miss a lower priority trigger if it occurs simultaneously with a

trigger of a higher priority. The trigger priorities described in Table 20-38 dictate that in the case of

simultaneous matches, the match on the lower channel number (0,1,2,3) has priority. The SC[3:0]

encoding ensures that a match leading to ﬁnal state has priority over all other matches independent of

current state sequencer state. When conﬁgured for range modes a simultaneous match of comparators A

and C generates an active match0 whilst match2 is suppressed.

Table 20-38. Trigger Priorities

Priority

Source

Action

Highest

XGATE

Immediate forced breakpoint......(Tracing terminated immediately).

TRIG

Enter Final State

External TAGHI/TAGLO

Enter State0

Match0 (force or tag hit)

Trigger to next state as deﬁned by state control registers

Match1 (force or tag hit)

Trigger to next state as deﬁned by state control registers

Match2 (force or tag hit)

Trigger to next state as deﬁned by state control registers

Lowest

Match3 (force or tag hit)

Trigger to next state as deﬁned by state control registers

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