HCS12 datasheet(366/452 Pages) FREESCALE

366 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

366

Freescale Semiconductor

prebyte is treated as a special 1-byte instruction. In cycle 1.0 of the WAV

instruction, one word of program information will be fetched into the

instruction queue if the $18 is located at an odd address. If the $18 is at an

even address, the instruction queue cannot advance so there is no bus

access in this cycle.

Figure 9-11. WAV and wavr Instruction Flow Diagram (for HCS12)

1.0 - O

READ PROGRAM WORD IF $18 MISALIGNED

1.1 - U

READ WORD @ 0,SP (UNSTACK TMP1)

SP = SP + 2

WAV

END

10.0 - O

READ PROGRAM WORD IF $3C MISALIGNED

ADJUST PC TO POINT AT NEXT INSTRUCTION

Y : D = TMP1 : TMP2; X = TMP3

2.1 - U

READ WORD @ 0,SP (UNSTACK TMP2)

SP = SP + 2

3.1 - U

READ WORD @ 0,SP (UNSTACK TMP3)

SP = SP + 2

4.1 - r

READ BYTE @ –1,Y (FUZZY OUTPUT Fi)

5.1 - r

READ BYTE @ –1,X (SINGLETON Si)

6.1 - S

WRITE WORD @ –2,SP (STACK TMP3)

SP = SP – 2

7.1 - S

WRITE WORD @ –2,SP (STACK TMP2)

SP = SP – 2

8.1 - S

WRITE WORD @ –2,SP (STACK TMP1)

SP = SP – 2

wavr

2.0 - f

NO BUS ACCESS

3.0 - f

NO BUS ACCESS

4.0 - f

CONTINUE TO INTERRUPT STACKING

B = 0?

YES

5.0 - r

Y = Y + 1 point at next fuzzy output

READ BYTE @ 0,X (SINGLETON Si)

X = X + 1 POINT AT NEXT SINGLETON

6.0 - f

NO BUS ACCESS

TMP3 = TMP3 + Fi

7.0 - f

NO BUS ACCESS

START MULTIPLY, PPROD = Si*Fi

8.0 - f

NO BUS ACCESS

FINISH MULTIPLY, TMP2 = TMP2 + PPROD

9.0 - f

NO BUS ACCESS

INTERRUPT PENDING?

YES

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

TMP1 = TMP2 = TMP3 = $0000

B = B – 1 DECREMENT ITERATION COUNTER

READ BYTE @ 0,Y (FUZZY OUTPUT Fi)

TMP1 = TMP1 + (CARRY FROM PPROD ADD)

HCS12 Datasheet(PDF) 366 Page - Freescale Semiconductor, Inc

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