S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 

Specifications of S3C44B0X

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Page 48/488

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S3C2400X01 RISC MICROPROCESSOR
Exception Entry/Exit Summary
Table 2-2 summarises the PC value preserved in the relevant R14 on exception entry, and the recommended
instruction for exiting the exception handler.
Return Instruction
BL
MOV PC, R14
SWI
MOVS PC, R14_svc
UDEF
MOVS PC, R14_und
FIQ
SUBS PC, R14_fiq, #4
IRQ
SUBS PC, R14_irq, #4
PABT
SUBS PC, R14_abt, #4
DABT
SUBS PC, R14_abt, #8
RESET
NA
NOTES:
1.
Where PC is the address of the BL/SWI/Undefined Instruction fetch which had the prefetch abort.
2.
Where PC is the address of the instruction which did not get executed since the FIQ or IRQ took priority.
3.
Where PC is the address of the Load or Store instruction which generated the data abort.
4.
The value saved in R14_svc upon reset is unpredictable.
FIQ
The FIQ (Fast Interrupt Request) exception is designed to support a data transfer or channel process, and in ARM
state has sufficient private registers to remove the need for register saving (thus minimising the overhead of context
switching).
FIQ is externally generated by taking the nFIQ input LOW. This input can except either synchronous or
asynchronous transitions, depending on the state of the ISYNC input signal. When ISYNC is LOW, nFIQ and nIRQ
are considered asynchronous, and a cycle delay for synchronization is incurred before the interrupt can affect the
processor flow.
Irrespective of whether the exception was entered from ARM or Thumb state, a FIQ handler should leave the interrupt
by executing
SUBS
PC,R14_fiq,#4
FIQ may be disabled by setting the CPSR's F flag (but note that this is not possible from User mode). If the F flag is
clear, ARM920T checks for a LOW level on the output of the FIQ synchroniser at the end of each instruction.
Table2-2. Exception Entry/Exit
Previous State
ARM R14_x
PC + 4
PC + 4
PC + 4
PC + 4
PC + 4
PC + 4
PC + 8
-
PROGRAMMER'S MODEL
Notes
THUMB R14_x
PC + 2
1
PC + 2
1
PC + 2
1
PC + 4
2
PC + 4
2
PC + 4
1
PC + 8
3
-
4
2-11