Texas Instruments TM4C1294NCPDT User Manual

■ An internally detected error such as an undefined instruction or an attempt to change state with
a BX instruction.
■ Attempting to execute an instruction from a memory region marked as Non-Executable (XN).
■ An MPU fault because of a privilege violation or an attempt to access an unmanaged region.
2.6.1 Fault Types
Table 2-11 on page 124 shows the types of fault, the handler used for the fault, the corresponding
fault status register, and the register bit that indicates the fault has occurred. See page 184 for more
information about the fault status registers.
Table 2-11. Faults
Bit NameFault Status RegisterHandlerFault
VECTHard Fault Status (HFAULTSTAT)Hard faultBus error on a vector read
FORCEDHard Fault Status (HFAULTSTAT)Hard faultFault escalated to a hard fault
IERR
a
Memory Management Fault Status
(MFAULTSTAT)
Memory management
fault
MPU or default memory mismatch on
instruction access
DERRMemory Management Fault Status
(MFAULTSTAT)
Memory management
fault
MPU or default memory mismatch on
data access
MSTKEMemory Management Fault Status
(MFAULTSTAT)
Memory management
fault
MPU or default memory mismatch on
exception stacking
MUSTKEMemory Management Fault Status
(MFAULTSTAT)
Memory management
fault
MPU or default memory mismatch on
exception unstacking
MLSPERRMemory Management Fault Status
(MFAULTSTAT)
Memory management
fault
MPU or default memory mismatch
during lazy floating-point state
preservation
BSTKEBus Fault Status (BFAULTSTAT)Bus faultBus error during exception stacking
BUSTKEBus Fault Status (BFAULTSTAT)Bus faultBus error during exception unstacking
IBUSBus Fault Status (BFAULTSTAT)Bus faultBus error during instruction prefetch
BLSPEBus Fault Status (BFAULTSTAT)Bus faultBus error during lazy floating-point state
preservation
PRECISEBus Fault Status (BFAULTSTAT)Bus faultPrecise data bus error
IMPREBus Fault Status (BFAULTSTAT)Bus faultImprecise data bus error
NOCPUsage Fault Status (UFAULTSTAT)Usage faultAttempt to access a coprocessor
UNDEFUsage Fault Status (UFAULTSTAT)Usage faultUndefined instruction
INVSTATUsage Fault Status (UFAULTSTAT)Usage faultAttempt to enter an invalid instruction
set state
b
INVPCUsage Fault Status (UFAULTSTAT)Usage faultInvalid EXC_RETURN value
UNALIGNUsage Fault Status (UFAULTSTAT)Usage faultIllegal unaligned load or store
DIV0Usage Fault Status (UFAULTSTAT)Usage faultDivide by 0
a. Occurs on an access to an XN region even if the MPU is disabled.
b. Attempting to use an instruction set other than the Thumb instruction set, or returning to a non load-store-multiply instruction
with ICI continuation.
2.6.2 Fault Escalation and Hard Faults
All fault exceptions except for hard fault have configurable exception priority (see SYSPRI1 on
page 177). Software can disable execution of the handlers for these faults (see SYSHNDCTRL on
page 180).
June 18, 2014124
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Texas Instruments TM4C1294NCPDT Specifications

General

Brand	Texas Instruments
Model	TM4C1294NCPDT
Category	Microcontrollers
Language	English