MC68340 datasheet(73/441 Pages) FREESCALE

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MC68340 USER’S MANUAL

MOTOROLA

ACKNOWLEDGE BREAKPOINT

IF BREAKPOINT INSTRUCTION EXECUTED:

1. SET R/W TO READ

2. SET FUNCTION CODE TO CPU SPACE

3. PLACE CPU SPACE TYPE 0 ON A19–A16

4. PLACE BREAKPOINT NUMBER ON A2–A4

5. CLEAR T-BIT (A1)

6. SET SIZE TO WORD

7. ASSERT AS AND DS

IF BKPT PIN ASSERTED:

1. SET R/W TO READ

2. SET FUNCTION CODE TO CPU SPACE

3. PLACE CPU SPACE TYPE 0 ON A19–A16

4. PLACE ALL ONE'S ON A4–A2

5. SET T-BIT (A-1) TO ONE

6. SET SIZE TO WORD

7. ASSERT AS AND DS

(A)

(B)

IF BREAKPOINT INSTRUCTION EXECUTED:

1. PLACE REPLACEMENT OPCODE ON DATA BUS

2. ASSERT DSACKx

-OR-

1. ASSERT BERR TO INITIATE EXCEPTION PROCESSING

IF BKPT PIN ASSERTED:

1. ASSERT DSACKx

-OR-

1. ASSERT BERR TO INITIATE EXCEPTION PROCESSING

1. NEGATE DSACKx or BERR

BREAKPOINT OPERATION FLOW

PROCESSOR

EXTERNAL DEVICE

IF BREAKPOINT INSTRUCTION EXECUTED AND

DSACKx IS ASSERTED:

1. LATCH DATA

2. NEGATE AS AND DS

3. GO TO (A)

IF BKPT PIN ASSERTED AND DSACKx IS ASSERTED:

1. NEGATE AS AND DS

2. GO TO (A)

IF BERR ASSERTED:

1. NEGATE AS AND DS

2. GO TO (B)

IF BREAKPOINT INSTRUCTION EXECUTED:

1. PLACE LATCHED DATA IN INSTRUCTION PIPELINE

2. CONTINUE PROCESSING

IF BKPT PIN ASSERTED:

1. CONTINUE PROCESSING

IF BREAKPOINT INSTRUCTION EXECUTED:

1. INITIATE ILLEGAL INSTRUCTION PROCESSING

IF BKPT PIN ASSERTED:

1. INITIATE HARDWARE BREAKPOINT PROCESSING

Figure 3-11. Breakpoint Operation Flowchart

Freescale Semiconductor, Inc.

For More Information On This Product,

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