s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 41
s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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S3C4510B
PROGRAMMER S MODEL
Exception Priorities
When multiple exceptions arise at the same time, a fixed priority system determines the order in which they are
handled:
Highest priority:
1. Reset
2. Data abort
3. FIQ
4. IRQ
5. Prefetch abort
Lowest priority:
6. Undefined Instruction, Software interrupt.
Not All Exceptions Can Occur at Once:
Undefined Instruction and Software Interrupt are mutually exclusive, since they each correspond to particular
(non-overlapping) decoding of the current instruction.
If a data abort occurs at the same time as a FIQ, and FIQs are enabled (ie the CPSR's F flag is clear),
ARM7TDMI enters the data abort handler and then immediately proceeds to the FIQ vector. A normal return from
FIQ will cause the data abort handler to resume execution. Placing data abort at a higher priority than FIQ is
necessary to ensure that the transfer error does not escape detection. The time for this exception entry should be
added to worst-case FIQ latency calculations.
2-15
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