EE 308

Using X and Y as Pointers

• Registers X and Y often used to point to data.
• To initialize pointer use

          ldx      #table
  

  not

          ldx      table
  

• For example

          ldx      #table    ;  Address of table => X
          ldx      table     ;  First two bytes of table => X
  

• To step through table, need to increment pointer after use

          ldaa     0,x
          inx
  

  or

          ldaa     1,x+