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S3C4530A Datasheet(Fiches technique) 22 Page - Samsung semiconductor

Numéro de pièce S3C4530A
Description  16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller
Télécharger  432 Pages
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Fabricant  SAMSUNG [Samsung semiconductor]
Site Internet  http://www.samsung.com/Products/Semiconductor
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 22 page
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PRODUCT OVERVIEW
S3C4530A
1-22
EXCEPTIONS
An exception arises when the normal flow of program execution is interrupted, e.g., when processing is diverted
to handle an interrupt from a peripheral. The processor state just prior to handling the exception must be
preserved so that the program flow can be resumed when the exception routine is completed. Multiple exceptions
may arise simultaneously.
To process exceptions, the S3C4530A uses the banked core registers to save the current state. The old PC value
and the CPSR contents are copied into the appropriate R14 (LR) and SPSR registers The PC and mode bits in
the CPSR are adjusted to the value corresponding to the type of exception being processed.
The S3C4530A core supports seven types of exceptions. Each exception has a fixed priority and a corresponding
privileged processor mode, as shown in Table 1-4.
Table 1-4. S3C4530A CPU Exceptions
Exception
Mode on Entry
Priority
Reset
Supervisor mode
1 (highest)
Data abort
Abort mode
2
FIQ
FIQ mode
3
IRQ
IRQ mode
4
Prefetch abort
Abort mode
5
Undefined instruction
Undefined mode
6
SWI
Supervisor mode
6 (lowest)




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Datasheet Download



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