HCS12 datasheet(362/452 Pages) FREESCALE

362 / 452 page

S12CPUV2 Reference Manual, Rev. 4.0

362

Freescale Semiconductor

Figure 9-10. REVW Instruction Flow Diagram

1.0 - O

READ PROGRAM WORD IF $18 MISALIGNED

2.0 - R

READ WORD @ 0,X (RULE ELEMENT Rx)

X = X + 2 POINT AT NEXT RULE ELEMENT

START

END

6.3 - f

NO BUS ACCESS

ADJUST X = X – 2 POINTER TO RULE LIST

INTERRUPT PENDING?

YES

5.0 - T

7.3 - f

NO BUS ACCESS

IF (Rx = $FFFE OR $FFFE) AND V = 0

CONTINUE TO INTERRUPT STACKING

6.0 - x

NO BUS ACCESS

A = MIN(A, FRx)

Rx = $FFFF (END OF RULES)?

YES

7.0 - O

READ PROGRAM WORD IF $3B MISALIGNED

3.0 - f

NO BUS ACCESS

TMP2 = Y – 1 (WEIGHT POINTER KEPT IN TMP2)

5.3 - f

ADJUST PC TO POINT AT CURRENT REVW INSTRUCTION

IF Rx $FFFF

X0 = X, X = X0 + 2

MIN/MAX/MUL?

MAX

MUL

MIN

V = 1 &

V=C=1 and

Rx=$FFFE

OR DEFAULT

7.2 - R

READ RULE WORD @,X0

CONTINUE MULTIPLY

8.2 - f

NO BUS ACCESS

FINISH MULTIPLY

6.2 - f

NO BUS ACCESS

BEGIN MULTIPLY OF (wt + 1) * A ﬁ A : B

RX $FFFE or $FFFF

6.1 - x

IF A > FRx WRITE A TO Rx

ELSE NO BUS ACCESS

ADJUST PC TO POINT AT NEXT INSTRUCTION

IF C = 1 (WEIGHTS ENABLED), Y = TMP2 + 1

THEN READ RULE WORD @,X0

8.3 - f

NO BUS ACCESS

Y = TMP2 + 1

NO BUS ACCESS

4.0 - t

IF Rx = $FFFE

ELSE NO BUS ACCESS

IF Rx = $FFFF

IF Rx = OTHER

THEN READ BYTE @,Rx FUZZY IN/OUT FRx

THEN NO BUS ACCESS

IF V = 0, THEN TMP2 = TMP2 + 1

THEN READ RULE WEIGHT @,TMP2

TOGGLE V BIT; IF V NOW 0, A = $FF

IF V = 0 AND C = 1,

UPDATE Rx WITH VALUE READ IN CYC 2 OR 5

THEN TMP2 = TMP2 – 1

HCS12 Datasheet(PDF) 362 Page - Freescale Semiconductor, Inc

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