HCS12 datasheet(367/452 Pages) FREESCALE

367 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

Freescale Semiconductor

367

Figure 9-12. WAV and wavr Instruction Flow Diagram (for M68HC12)

1.0 - O

READ PROGRAM WORD IF $18 MISALIGNED

2.1 - U

READ WORD @ 0,SP (UNSTACK TMP3)

SP = SP + 2

WAV

END

12.0 - O

READ PROGRAM WORD IF $3C MISALIGNED

ADJUST PC TO POINT AT NEXT INSTRUCTION

Y : D = TMP3 : TMP2; X = TMP1

3.1 - U

READ WORD @ 0,SP (UNSTACK TMP2)

SP = SP + 2

4.1 - U

READ WORD @ 0,SP (UNSTACK TMP1)

SP = SP + 2

5.1 - r

READ BYTE @ –1,Y (FUZZY OUTPUT Fi)

6.1 - r

READ BYTE @ –1,X (SINGLETON Si)

7.1 - S

WRITE WORD @ –2,SP (STACK TMP1)

SP = SP – 2

8.1 - S

WRITE WORD @ –2,SP (STACK TMP2)

SP = SP – 2

9.1 - S

WRITE WORD @ –2,SP (STACK TMP3)

SP = SP – 2

wavr

2.0 - f

NO BUS ACCESS

3.0 - f

NO BUS ACCESS

TMP1 = TMP2 = TMP3 = $0000

4.0 - f

NO BUS ACCESS

B = B – 1 DECREMENT ITERATION COUNTER

CONTINUE TO INTERRUPT STACKING

B = 0?

YES

5.0 - r

READ BYTE @ 0,Y (FUZZY OUTPUT Fi)

Y = Y + 1 point at next fuzzy output

6.0 - r

READ BYTE @ 0,X (SINGLETON Si)

X = X + 1 POINT AT NEXT SINGLETON

7.0 - f

NO BUS ACCESS

TMP1 = TMP1 + Fi

8.0 - f

NO BUS ACCESS

START MULTIPLY PPROD = Si*Fi

9.0 - f

NO BUS ACCESS

CONTINUE MULTIPLY

10.0 - f

NO BUS ACCESS

FINISH MULTIPLY, TMP2 = TMP2 + PPROD

11.0 - f

NO BUS ACCESS

TMP3 = TMP3 + (CARRY FROM PPROD ADD)

INTERRUPT PENDING?

YES

ADJUST PC TO POINT AT $3C wavr PSEUDO-OPCODE

10.1 - f

NO BUS ACCESS

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