HCS08 datasheet(258/290 Pages) MOTOROLA

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Development Support

MC9S08GB/GT

258

MOTOROLA

15.5.3.9 Debug Status Register (DBGS)

This is a read-only status register.

Figure 15-9 Debug Status Register (DBGS)

AF — Trigger Match A Flag

AF is cleared at the start of a debug run and indicates whether a trigger match A condition was met

since arming.

1 = Comparator A match.

0 = Comparator A has not matched.

BF — Trigger Match B Flag

BF is cleared at the start of a debug run and indicates whether a trigger match B condition was met

since arming.

1 = Comparator B match.

0 = Comparator B has not matched.

Table 15-2 Trigger Mode Selection

TRG[3:0]

Triggering Mode

0000

A-only

0001

A OR B

0010

A Then B

0011

Event-only B (store data)

0100

A then event-only B (store data)

0101

A AND B data (full mode)

0110

A AND NOT B data (full mode)

0111

Inside range: A

≤ address ≤ B

1000

Outside range: address < A or address > B

1001 – 1111

No trigger

Bit 7

4321

Bit 0

Read:

ARMF

CNT3

CNT2

CNT1

CNT0

Write:

Reset:

00000

= Unimplemented or Reserved

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