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8- 16 M68040 USER’S MANUAL MOTOROLA
EXIT
FETCH VECTOR
FROM INTERRUPTING
DEVICE
PREFETCH FOUR
LONG WORDS
VECTOR
PC
OTHERWISE
BEGIN INSTRUCTION 
EXECUTION
BUS ERROR
BUS ERROR OR
ADDRESS ERROR
HALTED STATE
(PST3–PST0 = $5)
ENTRY
EXIT
SAVE INTERNAL 
COPY OF SR
S
T1, T0
I2–I0
1
00
LEVEL OF
INTERUPT
=
=
=
AUTOVECTOR 25–31
SPURIOUS INTERRUPT
VECTOR #24
BUS ERROR
IF NO VECTOR #
OTHERWISE
IF M = 0
THEN VECTOR OFFSET,
PC, AND SR
ACTIVE
STACK FRAME
M 0; VECTOR
OFFSET, PC, AND SR
THROWAWAY
STACK FRAME ON ISP
(DOUBLE BUS FAULT)
Figure 8-4. Interrupt Exception Processing Flowchart
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