MC68340 datasheet(232/441 Pages) FREESCALE

232 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

5- 95

CLOCK

BUS

CONTROLLER

INSTRUCTION

CONTROLLER

EXECUTION

TIME

WRITE

FOR 1

1 PRE-

FETCH

READ

FOR 2

WRITE

FOR 2

2 PRE-

FETCH

ADDQ

TO <EA>

ADDQ.W #1,(AO)

EA FETCH

ADDQ

MOVE A1,(AO)+

MOVE.W A1,(AO)+

EA CALC

CLR

<EA>

3 PRE-

FETCH

3 PRE-

FETCH

WRITE

FOR 3

CLR.W $30(A1)

Figure 5-33. Example 1—Instruction Stream

5.7.2.2 TIMING EXAMPLE 2—BRANCH INSTRUCTIONS. Example 2 shows what

happens when a branch instruction is executed for both the taken and not-taken cases.

(see Figures 5-34 and 5-35). The instruction stream is for a simple limit check with the

variable already in a data register.

Instructions

MOVEQ

#7, D1

CMP.L

D1, D0

BLE.B

MOVE.L

D1, (A0)

CLOCK

BUS

CONTROLLER

INSTRUCTION

CONTROLLER

EXECUTION

TIME

1 PRE-

FETCH

CMP

D1,D0

2 PRE-

FETCH

WRITE

FOR 3

CMP

MOVEQ

#7,D1

BLE.B NOT TAKEN

OFFSET

CALC

INST.

PRE-

FETCH

PRE-

FETCH

PRE-

FETCH

TAKEN

Figure 5-34. Example 2—Branch Taken

Freescale Semiconductor, Inc.

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