LDY                   LDY Load index Y with memory                    LDY

  Operation:  M -> Y                                    N V - B D I Z C
                                                        / . . . . . / .

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Immediate     |   LDY #$FF            |   $A0   |    2    |    2     |
  |  ZeroPage      |   LDY $FF             |   $A4   |    2    |    3     |
  |  ZeroPage,X    |   LDY $FF,X           |   $B4   |    2    |    4     |
  |  Absolute      |   LDY $FFFF           |   $AC   |    3    |    4     |
  |  Absolute,X    |   LDY $FFFF,X         |   $BC   |    3    |    4*    |
  +----------------+-----------------------+---------+---------+----------+
  * Add 1 when page boundary is crossed.
  For penalty cycles on the 65816, check the desired addressing mode.