|Affected||IR, and according to specified instruction|
If sr contains a memory reference instruction with P-relative addressing, the address will be relative to the value of the P register for the EXR instruction. If sr contains a JPL instruction, the L register will point to the instruction after the EXR instruction.
It is illegal to use EXR <sr> to fetch another EXR <sr> instruction. Attempting this will set the error flag Z in the status register.