s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 40

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

PROGRAMMER'S MODEL
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):
This restores the PC and CPSR, and returns to the instruction following the SWI.
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):
This restores the CPSR and returns to the instruction following the undefined instruction.
Exception Vectors
The following table shows the exception vector addresses.
2-14
nFIQ, nIRQ, ISYNC, LOCK, BIGEND, and ABORT pins exist only in the ARM7TDMI CPU core.
MOV
MOVS
0x0000000C
0x0000001C
0x00000000
0x00000004
0x00000008
0x00000010
0x00000014
0x00000018
Address
PC,R14_svc
PC,R14_und
Table 2-3. Exception Vectors
Reset
Undefined instruction
Software Interrupt
Abort (prefetch)
Abort (data)
Reserved
IRQ
FIQ
Exception
NOTE
Supervisor
Undefined
Supervisor
Abort
Abort
Reserved
IRQ
FIQ
Mode in Entry
S3C4510B