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Exception Processing
MOTOROLA
M68060 USER’S MANUAL
8-15
error occurs during the exception processing sequence for a reset, a double bus fault is gen-
erated. The processor halts and signals the double bus fault status on the processor status
outputs ([PST4–PST0] = $1C). Execution of the reset instruction does not cause a reset
exception, nor does it affect any internal registers except the PC. The execution of this
Figure 8-4. Interrupt Exception Processing Flowchart
EXIT
FETCH VECTOR
FROM INTERRUPTING
DEVICE
FETCH FIRST
INSTRUCTION
OF HANDLER
CALCULATE ADDRESS
OF FIRST INSTRUCTION
OF HANDLER
OTHERWISE
BEGIN INSTRUCTION
EXECUTION
BUS ERROR
BUS ERROR OR
ADDRESS ERROR
PROCESS
ACCESS ERROR
ENTRY
EXIT
SAVE INTERNAL
COPY OF SR
S
T
I2–I0
1
0
LEVEL OF
INTERRUPT
=
=
=
AUTOVECTOR #25–#31
SPURIOUS INTERRUPT
VECTOR #24
BUS ERROR
IF NO VECTOR #
VECTOR OFFSET,
PC, AND SR
STACK FRAME
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