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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller TFBGA 100 (9x9) 32-Bit 48 MHz I/O number 79
61626364656667686970
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11011B–ATARM–21-Feb-12
SAM3N
vided by the reset entry in the vector table. Execution restarts as privileged execution in Thread
mode.
10.6.2.2 Non Maskable Interrupt (NMI)
A non maskable interrupt (NMI) can be signalled by a peripheral or triggered by software. This is
the highest priority exception other than reset. It is permanently enabled and has a fixed priority
of -2.
NMIs cannot be:
• Masked or prevented from activation by any other exception.
• Preempted by any exception other than Reset.
10.6.2.3 Hard fault
A hard fault is an exception that occurs because of an error during exception processing, or
because an exception cannot be managed by any other exception mechanism. Hard faults have
a fixed priority of -1, meaning they have higher priority than any exception with configurable
priority.
10.6.2.4 Bus fault
A bus fault is an exception that occurs because of a memory related fault for an instruction or
data memory transaction. This might be from an error detected on a bus in the memory system.
10.6.2.5 Usage fault
A usage fault is an exception that occurs because of a fault related to instruction execution. This
includes:
• an undefined instruction
• an illegal unaligned access
• invalid state on instruction execution
• an error on exception return.
The following can cause a usage fault when the core is configured to report them:
• an unaligned address on word and halfword memory access
• division by zero.
10.6.2.6 SVCall
A supervisor call (SVC) is an exception that is triggered by the SVC instruction. In an OS envi-
ronment, applications can use SVC instructions to access OS kernel functions and device
drivers.
10.6.2.7 PendSV
PendSV is an interrupt-driven request for system-level service. In an OS environment, use
PendSV for context switching when no other exception is active.
10.6.2.8 SysTick
A SysTick exception is an exception the system timer generates when it reaches zero. Software
can also generate a SysTick exception. In an OS environment, the processor can use this
exception as system tick.