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S3C4530A Datasheet(Fiches technique) 40 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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 40 page
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PROGRAMMER'S MODEL
S3C4530A
2-14
Software Interrupt
The software interrupt instruction (SWI) is used for entering Supervisor mode, usually to request a particular
supervisor function. A SWI handler should return by executing the following irrespective of the state (ARM or
Thumb):
MOV
PC,R14_svc
This restores the PC and CPSR, and returns to the instruction following the SWI.
NOTE
nFIQ, nIRQ, ISYNC, LOCK, BIGEND, and ABORT pins exist only in the ARM7TDMI CPU core.
Undefined Instruction
When ARM7TDMI comes across an instruction which it cannot handle, it takes the undefined instruction trap.
This mechanism may be used to extend either the THUMB or ARM instruction set by software emulation.
After emulating the failed instruction, the trap handler should execute the following irrespective of the state (ARM
or Thumb):
MOVS
PC,R14_und
This restores the CPSR and returns to the instruction following the undefined instruction.
Exception Vectors
The following table shows the exception vector addresses.
Table 2-3. Exception Vectors
Address
Exception
Mode in Entry
0x00000000
Reset
Supervisor
0x00000004
Undefined instruction
Undefined
0x00000008
Software Interrupt
Supervisor
0x0000000C
Abort (prefetch)
Abort
0x00000010
Abort (data)
Abort
0x00000014
Reserved
Reserved
0x00000018
IRQ
IRQ
0x0000001C
FIQ
FIQ




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