If implemented, the VTOR indicates the offset of the vector
table base address from memory address
See the register summary in Table 4.12 for its attributes.
The bit assignments are:
Vector table base offset field. It contains bits[31:7] of the offset of the table base from the bottom of the memory map.
The vector table base must always be aligned to at least the number of exception vectors implemented. To ensure this, the Cortex-M0+ processor implements bit (the least significant bit of TBLOFF) as RAZ/WI.