Question

this is general purpose field containing any data​

Answer 1

Explanation:

As we've seen, the Cortex™-M3 processor has registers R0 through R15 and a number of special registers. R0 through R12 are general purpose, but some of the 16-bit Thumb® instructions can only access R0 through R7 (low registers), whereas 32-bit Thumb-2 instructions can access all these registers. Special registers have predefined functions and can only be accessed by special register access instructions.