RTI                    RTI Return from interrupt                      RTI

  Operation:  P from Stack, PC from Stack               N V - B D I Z C
                                                          From Stack

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Implied/Stack |   RTI                 |   $40   |    1    |    6     |
  +----------------+-----------------------+---------+---------+----------+