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Chapter 19 S12X Debug (S12XDBGV2) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

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Freescale Semiconductor

19.4.7.2

Breakpoints From Internal Comparator Channel Final State Triggers

Breakpoints can be generated when internal comparator channels trigger the state sequencer to the ﬁnal

state. If conﬁgured for tagging, then the breakpoint is generated when the tagged opcode reaches the

execution stage of the instruction queue. If an end aligned trigger is selected or no tracing is enabled,

breakpoints can be generated immediately, depending on the state of the DBGBRK[n] bits.

If a begin or mid aligned tracing session is selected by the TSOURCE bits, breakpoints are requested when

the tracing session has completed, thus the breakpoint is requested only on completion of the subsequent

trace (see Table 19-44). If the BRK bit is set on the triggering channel, then the breakpoint is generated

immediately independent of tracing trigger alignment.

19.4.7.3

Breakpoints Generated Via The TRIG Bit

If a TRIG triggers occur, the ﬁnal state is entered. Tracing trigger alignment is deﬁned by the TALIGN

bits. If a tracing session is selected by the TSOURCE bits, breakpoints are requested when the tracing

session has completed, thus if begin or mid aligned triggering is selected, the breakpoint is requested only

on completion of the subsequent trace. If no tracing session is selected, breakpoints are requested

immediately. TRIG breakpoints are possible even if the DBG module is disarmed. TRIG bit breakpoints

are enabled by setting DBGBRK[n].

19.4.7.4

Breakpoints via TAGHI Or TAGLO Pin Taghits

Tagging using the external TAGHI/TAGLO pins always ends the session immediately at the tag hit. It is

always end aligned, independent of internal channel trigger alignment conﬁguration. External tag

breakpoints are always mapped to the CPU, are only possible in emulation modes and can be enabled by

setting DBGBRK[1].

Table 19-44. Setup for Both XGATE and CPU Breakpoints

BRK

TALIGN

DBGBRK[n]

Type of Debug Session

Fill trace buffer until trigger

(no breakpoints — keep running)

Fill trace buffer until trigger, then a breakpoint request occurs

Start trace buffer at trigger

(no breakpoints — keep running)

Start trace buffer at trigger

A breakpoint request occurs when trace buffer is full

Start trace buffer at trigger

End tracing 32 line entries after trigger

(no breakpoints — keep running)

Start trace buffer at trigger

End tracing 32 line entries after trigger

Request breakpoint after the 32 further trace buffer entries

00,01,10

Terminate tracing immediately on trigger without breakpoint

00,01,10

Terminate tracing and generate breakpoint immediately on trigger

Reserved

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