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S3C4530A Datasheet(PDF) 41 Page - Samsung semiconductor

Part No. S3C4530A
Description  16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller
Download  432 Pages
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Maker  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
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S3C4530A Datasheet(HTML) 41 Page - Samsung semiconductor

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S3C4530A
PROGRAMMER
′′S MODEL
2-15
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.


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