SAM3X8C Atmel Corporation, SAM3X8C Datasheet - Page 83

• Manufacturer Part Number: SAM3X8C
• Manufacturer: Atmel Corporation

11.7
11.7.1
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Fault handling
Fault types
Faults are a subset of the exceptions, see
ate a fault:
Table 11-11
tus register, and the register bit that indicates that the fault has occurred. See
Fault Status Register” on page 181
Table 11-11. Faults
1.
2.
Fault
Bus error on a vector read
Fault escalated to a hard fault
MPU mismatch:
Bus error:
Precise data bus error
Imprecise data bus error
Attempt to access a coprocessor
Undefined instruction
Attempt to enter an invalid instruction
set state
Invalid EXC_RETURN value
Illegal unaligned load or store
Divide By 0
• an internally-detected error such as an undefined instruction or an attempt to change state
• attempting to execute an instruction from a memory region marked as Non-Executable
• an MPU fault because of a privilege violation or an attempt to access an unmanaged region.
with a BX instruction
on instruction access
on data access
during exception stacking
during exception unstacking
during exception stacking
during exception unstacking
during instruction prefetch
– a bus error on:
– an instruction fetch or vector table load
– a data access
Occurs on an access to an XN region even if the MPU is disabled.
Attempting to use an instruction set other than the Thumb instruction set.
(2)
shows the types of fault, the handler used for the fault, the corresponding fault sta-
for more information about the fault status registers.
Handler
Hard fault
Memory
managem
ent fault
Bus fault
Usage
fault
“Exception model” on page
Bit name
VECTTBL
FORCED
-
IACCVIOL
DACCVIOL
MSTKERR
MUNSKERR
-
STKERR
UNSTKERR
IBUSERR
PRECISERR
IMPRECISER
R
NOCP
UNDEFINSTR
INVSTATE
INVPC
UNALIGNED
DIVBYZERO
(1)
Fault status register
“Hard Fault Status
Register” on page 187
-
“Memory Management
Fault Address Register” on
page 188
-
“Bus Fault Status Register”
on page 183
“Usage Fault Status
Register” on page 185
76. The following gener-
SAM3X/A
SAM3X/A
“Configurable
(XN).
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