MC68030RC33

Manufacturer Part NumberMC68030RC33
DescriptionMC68030RC33ENHANCED 32-BIT MICROPROCESSOR
ManufacturerMotorola
MC68030RC33 datasheet
 
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Page 278/602:

Return from Exception

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Exception Processing
Table 8-5. Exception Priority Groups
Group/Priority
Exception and Relative Priority
0
0.0 — Reset
1
1.0 — Address Error
1.1 — Bus Error
2
2.0 — BKPT #n, CHK, CHK2, cp Mid-Instruction, cp
Protocol Violation, cpTRAPcc, Divide by Zero,
RTE, TRAP #n, TRAPV, MMU Configuration
3
3.0 — Illegal Instruction, Line A, Unimplemented Line
F, Privilege Violation, cp Pre-Instruction
4
4.0 — cp Post-Instruction
4.1 — Trace
4.2 — Interrupt
0.0 is the highest priority, 4.2 is the lowest.
The priority scheme is very important in determining the order in which exception handlers
execute when several exceptions occur at the same time. As a general rule, the lower the
priority of an exception, the sooner the handler routine for that exception executes. For
example, if simultaneous trap, trace, and interrupt exceptions are pending, the exception
processing for the trap occurs first, followed immediately by exception processing for the
trace and then for the interrupt. When the processor resumes normal instruction execution,
it is in the interrupt handler, which returns to the trace handler, which returns to the trap
exception handler. This rule does not apply to the reset exception; its handler is executed
first even though it has the highest priority because the reset operation clears all other
exceptions.
8.1.13 Return from Exception
After the processor has completed exception processing for all pending exceptions, the
processor resumes normal instruction execution at the address in the vector for the last
exception processed. Once the exception handler has completed execution, the processor
must return to the system context prior to the exception (if possible). The RTE instruction
returns from the handler to the previous system context for any exception.
8-24
Aborts all processing (instruction or
exception) and does not save old context.
Suspends processing (instruction or
exception) and saves internal context.
Exception processing is part of instruction
execution.
Exception processing begins before
instruction is executed.
Exception processing begins when current
instruction or previous exception processing
is completed.
MC68030 USER’S MANUAL
Characteristics
MOTOROLA