Explain the M3 (Interrupt/ Exception) vector table.

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hetalgosavi • 1.6k

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The vector table contains the reset value of the stack pointer, and the start addresses, also called exception vectors, for all exception handlers.
Figure below 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, see Thumb state.

IVT

On system reset, the vector table is fixed at address 0x00000000. Privileged software can write to the VTOR (Vector Table Offset Register) to relocate the vector table start address to a different memory location, in the range 0x00000080 to 0x3FFFFF80
The Exceptions are numbered from1 to 15 for system exceptions and 16 and above for external interrupt inputs.
Most of the exceptions have programmable priority, and a few have fixed priority.
Cortex M3 can support 1-240 interrupt.
The list of system Exceptions is as follows -

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