2.6.4.3.3 Restrictions

In these instructions:

• Rn must not be PC
• Rm must not be SP and must not be PC
• Rt can be SP only for word loads and word stores
• Rt can be PC only for word loads.

When Rt is PC in a word load instruction:

• Bit[0] of the loaded value must be 1 for correct execution, and a branch occurs to this halfword-aligned address
• If the instruction is conditional, it must be the last instruction in the IT block.