Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 75

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

the return stack and processor mode. 

return behavior. 

All EXC_RETURN values have bits[31:5] set to one. When this value is loaded into the PC, it indicates to the processor
that the exception is complete, and the processor initiates the appropriate exception return sequence. 



A bus error on:



An instruction fetch or vector table load



A data access



An internally-detected error such as an undefined instruction 



An attempt to execute an instruction from a memory region marked as Non-Executable (XN)

.



A privilege violation or an attempt to access an unmanaged region causing an MPU fault.

 shows the types of fault, the handler used for the fault, the corresponding fault status register, and the

register bit that indicates that the fault has occurred. See 

 for more information about

the fault status registers.

0xFFFFFFF1

Return to Handler mode, exception return uses non-floating-point state 
from the MSP and execution uses MSP after return.

0xFFFFFFF9

Return to Thread mode, exception return uses non-floating-point state from 
MSP and execution uses MSP after return.

0xFFFFFFFD

Return to Thread mode, exception return uses non-floating-point state from 
the PSP and execution uses PSP after return.

Bus error on a vector read

Hard fault

VECTTBL

Fault escalated to a hard fault

FORCED

MPU or default memory map mismatch:

Memory 
management 
fault

-

-

on instruction access

IACCVIOL 

on data access

DACCVIOL

during exception stacking

MSTKERR

during exception unstacking

MUNSKERR

during lazy floating-point state preservation

MLSPERR

Bus error:

Bus fault 

-

-

during exception stacking

STKERR

during exception unstacking

UNSTKERR

during instruction prefetch

IBUSERR

during lazy floating-point state preservation

LSPERR

Precise data bus error

PRECISERR

Imprecise data bus error

IMPRECISERR