MPC8540 datasheet(1118/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

20-12

Freescale Semiconductor

Debug Features and Watchpoint Facility

Table 20-7 describes WMCR0 fields.

Table 20-7. WMCR0 Field Descriptions

Bits

Name

Description

Enable

0 Watchpoint monitor events are not flagged.

1 A watchpoint monitor event is flagged.

AMD

Address match disable. Qualifies address match as a watchpoint event criterion.

0 Address matching is used to recognize a watchpoint event.

1 Address matching does not affect watchpoint event detection.

TMD

Transaction match disable. Qualifies transaction type match (as defined in WMCR1[IFSEL] and WMTMR) as

a watchpoint event criterion.

0 A transaction type match is used to recognize watchpoint events.

1 A transaction type match does not affect watchpoint event detection.

ECEN

Equal context enable. Qualifies the matching of current context with programmed context as a watchpoint

event criterion, as written in the context registers described in Section 20.3.3, “Context ID Registers.”

0 Current context match does not affect watchpoint event detection

1 Watchpoint events are qualified by comparing current context with the programmed context event value.

Note: ECEN and NECEN must not be enabled in the same run. If both are set, watchpoint events are

inhibited (never occur).

NECEN Not equal context enable. Qualifies the matching of current context with programmed context as a watchpoint

event criterion, as written in the context registers described in Section 20.3.3, “Context ID Registers.”

0 The failure of a current context match does not affect watchpoint event detection

1 Watchpoint events are qualified with NOT getting a current context compare with the programmed context

event value.

Note: ECEN and NECEN must not be enabled in the same run. If both are set, watchpoint events are

inhibited (never occur).

SIDEN

Source ID enable

0 Source ID does not affect watchpoint event detection

1 Watchpoint events are qualified by comparison with the programmed WMCR1(SID) value.

TIDEN

Target ID enable

0 Target ID does not affect watchpoint event detection

1 Watchpoint events are qualified by comparison with the programmed WMCR1(TID) value.

7–20

—

Reserved

21–23

STRT

Start condition. Specifies the event that arms the watchpoint monitor to start looking for the programmed

event.

000 No event. Armed immediately

001 Trace buffer event is detected

010 Performance monitor signals overflow

011 TRIG_IN transitions from 0 to 1.

100 TRIG_IN transitions from 1 to 0.

101 Current context ID equals programmed context ID

110 Current context ID is not equal to programmed context ID

111 Reserved

24–31

—

Reserved

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