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Datasheet

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SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
12.4.3.3 Exception Handlers
The processor handles exceptions using:
Interrupt Service Routines (ISRs)
Interrupts IRQ0 to IRQ34 are the exceptions handled by ISRs.
Fault Handlers
Hard fault, memory management fault, usage fault, bus fault are fault exceptions handled by the fault
handlers.
System Handlers
NMI, PendSV, SVCall SysTick, and the fault exceptions are all system exceptions that are handled by
system handlers.
12.4.3.4 Vector Table
The vector table contains the reset value of the stack pointer, and the start addresses, also called exception
vectors, for all exception handlers. Figure 12-6 shows the order of the exception vectors in the vector table. The
least-significant bit of each vector must be 1, indicating that the exception handler is Thumb code.
Figure 12-6. Vector Table
On system reset, the vector table is fixed at address 0x00000000. Privileged software can write to the SCB_VTOR
to relocate the vector table start address to a different memory location, in the range 0x00000080 to 0x3FFFFF80,
see “Vector Table Offset Register” .