ATSAM3S-EK Atmel, ATSAM3S-EK Datasheet - Page 72
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ATSAM3S-EK
Manufacturer Part Number
ATSAM3S-EK
Description
KIT EVAL FOR ATSAM3S4C
Manufacturer
Atmel
Series
SAM3Sr
Type
MCUr
Specifications of ATSAM3S-EK
Contents
Board, Cables, Power Supply
Silicon Manufacturer
Atmel
Core Architecture
ARM
Core Sub-architecture
Cortex-M3
Kit Contents
Board
Features
TFT Colour LCD Display, SD/MMC Interface
Svhc
No SVHC (15-Dec-2010)
Rohs Compliant
Yes
For Use With/related Products
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATSAM3S-EK
Manufacturer:
Atmel
Quantity:
135
- Current page: 72 of 1118
- Download datasheet (24Mb)
10.7.3
10.7.4
72
SAM3S Preliminary
Fault status registers and fault address registers
Lockup
Usually, the exception priority, together with the values of the exception mask registers, deter-
mines whether the processor enters the fault handler, and whether a fault handler can preempt
another fault handler. as described in
In some situations, a fault with configurable priority is treated as a hard fault. This is called prior-
ity escalation, and the fault is described as escalated to hard fault. Escalation to hard fault
occurs when:
If a bus fault occurs during a stack push when entering a bus fault handler, the bus fault does not
escalate to a hard fault. This means that if a corrupted stack causes a fault, the fault handler
executes even though the stack push for the handler failed. The fault handler operates but the
stack contents are corrupted.
Only Reset and NMI can preempt the fixed priority hard fault. A hard fault can preempt any
exception other than Reset, NMI, or another hard fault.
The fault status registers indicate the cause of a fault. For bus faults and memory management
faults, the fault address register indicates the address accessed by the operation that caused
the fault, as shown in
Table 10-12. Fault status and fault address registers
The processor enters a lockup state if a hard fault occurs when executing the hard fault han-
dlers. When the processor is in lockup state it does not execute any instructions. The processor
remains in lockup state until:
Handler
Hard fault
Memory
management fault
Bus fault
Usage fault
• A fault handler causes the same kind of fault as the one it is servicing. This escalation to hard
• A fault handler causes a fault with the same or lower priority as the fault it is servicing. This is
• An exception handler causes a fault for which the priority is the same as or lower than the
• A fault occurs and the handler for that fault is not enabled.
• it is reset
fault occurs because a fault handler cannot preempt itself because it must have the same
priority as the current priority level.
because the handler for the new fault cannot preempt the currently executing fault handler.
currently executing exception.
Status register
name
HFSR
MMFSR
BFSR
UFSR
Table
10-12.
“Exception model” on page
Address register
name
-
MMFAR
BFAR
-
Register description
“Hard Fault Status Register” on page
187
“Memory Management Fault Status
Register” on page 182
“Memory Management Fault Address
Register” on page 188
“Bus Fault Status Register” on page 183
“Bus Fault Address Register” on page
189
“Usage Fault Status Register” on page
185
63.
6500C–ATARM–8-Feb-11
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