MC68340 datasheet(249/441 Pages) FREESCALE

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5- 112

MC68340 USER’S MANUAL

MOTOROLA

5.7.3.13 EXCEPTION-RELATED INSTRUCTIONS AND OPERATIONS. The exception-

related instructions and operations table indicates the number of clock periods needed for

the processor to perform the specified exception-related actions. No additional tables are

needed to calculate total effective execution time for these instructions. The total number

of clock cycles is outside the parentheses. The numbers inside parentheses (r/p/w) are

included in the total clock cycle number. All timing data assumes two-clock reads and

writes.

Instruction

Head

Tail

Cycles

BKPT (Acknowledged)

14(1/0/0)

BKPT (Bus Error)

−2

35(3/2/4)

Breakpoint (Acknowledged)

10(1/0/0)

Breakpoint (Bus Error)

−2

42(3/2/6)

Interrupt

−2

30(3/2/4)

∗

RESET

518(0/1/0)

STOP

12(0/1/0)

LPSTOP

−2

25(0/3/1)

Divide-by-Zero

−2

36(2/2/6)

Trace

−2

36(2/2/6)

TRAP #

−2

29(2/2/4)

ILLEGAL

−2

25(2/2/4)

A-line

−2

25(2/2/4)

F-line (First word illegal)

−2

25(2/2/4)

F-line (Second word illegal) ea = Rn

−2

31(2/3/4)

F-line (Second word illegal) ea

≠ Rn (Save)

3(0/1/0)

F-line (Second word illegal) ea

≠ Rn (Op)

−2

29(2/2/4)

Privileged

−2

25(2/2/4)

TRAPcc (trap)

−2

38(2/2/6)

TRAPcc (no trap)

4(0/1/0)

TRAPcc.W (trap)

−2

38(2/2/6)

TRAPcc.W (no trap)

4(0/2/0)

TRAPcc.L (trap)

−2

38(2/2/6)

TRAPcc.L (no trap)

6(0/3/0)

TRAPV (trap)

−2

38(2/2/6)

TRAPV (no trap)

4(0/1/0)

∗ = Minimum interrupt acknowledge cycle time is assumed to be three clocks.

NOTE: The F-line (second word illegal) operation involves a save step which other

operations do not have. To calculate the total operation time, calculate the save, the

calculate EA, and the operation execution times, and combine in the order

listed, using the equations given in 5.7.1.6 Instruction Execution Time

Calculation.

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