PLP               PLP Pull processor status from stack                PLP

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

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Implied/Stack |   PLP                 |   $28   |    1    |    4     |
  +----------------+-----------------------+---------+---------+----------+

What it does: Pulls the top byte off the stack and puts it into the Status Register (where the flags are). PLP is a mnemonic for PuLl Processor status.

Major uses: To restore the condition of the flags after the Status Register has been temporarily stored on top of the stack (with the PHP instruction). It is the opposite action of PHP. PLP, of course, affects all the flags. Any PHP must be matched by a corresponding PLP if the stack is to correctly maintain RTS addresses, which is the main purpose of the stack.