HCS12 datasheet(319/452 Pages) FREESCALE

319 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

319

Figure 7-1. Exception Processing Flow Diagram

PUSH CCR (BYTE)

8.2 - s

1.0 - V

FETCH VECTOR

2.0 - f

NO BUS ACCESS

SET S, X, AND I

START

END

YES

RESET?

INTERRUPT?

2.1 - S

PUSH RETURN ADDRESS

ADDRESS OF INST THAT WOULD HAVE

2.2 - S

PUSH RETURN ADDRESS

ADDRESS OF INST AFTER SWI OR

EXECUTED IF NO INTERRUPT

UNIMPLEMENTED OPCODE

3.0 - P

FETCH PROGRAM WORD

START TO FILL INSTRUCTION QUEUE

4.0 - P

FETCH PROGRAM WORD

CONTINUE TO FILL INSTRUCTION

5.0 - P

FETCH PROGRAM WORD

FINISH FILLING INSTRUCTION QUEUE

3.2 - P

FETCH PROGRAM WORD

START TO FILL INSTRUCTION QUEUE

4.2 - S

PUSH Y

6.2 - P

FETCH PROGRAM WORD

CONTINUE TO FILL INST. QUEUE

9.2 - P

FETCH PROGRAM WORD

FINISH FILLING INSTRUCTION QUEUE

5.2 - S

PUSH X

TRANSFER B:A TO 16-BIT TEMP REG

7.2 - S

PUSH B:A

SET I BIT

END

3.1 - P

FETCH PROGRAM WORD

START TO FILL INSTRUCTION QUEUE

4.1 - S

PUSH Y

6.1 - P

FETCH PROGRAM WORD

CONTINUE TO FILL INST. QUEUE

9.1 - P

FETCH PROGRAM WORD

FINISH FILLING INSTRUCTION QUEUE

5.1 - S

PUSH X

TRANSFER B:A TO 16-BIT TEMP REG

7.1 - S

PUSH B:A

8.1 - s

PUSH CCR (BYTE)

SET I BIT

IF XIRQ, SET X BIT

END

YES

OPCODE TRAP?

YES

T.1 - f

INTERNAL CALCULATIONS

QUEUE

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