6510/65816 Addressing mode: Zeropage/Direct Indexed -- d,x  d,y

 (BIT,STZ,STY,LDY,ORA,AND,EOR,ADC,STA,LDA,CMP,SBC,STX,LDX,LAX,NOP,SAX)
 (2 bytes)   (4,5 and 6 cycles)

    +---------------+------------------+-----------------------+----------+
    |     Cycle     |   Address Bus    |       Data Bus        |Read/Write|
    +---------------+------------------+-----------------------+----------+
    |           1   |  PBR,PC          | Op Code               |    R     |
    |           2   |  PBR,PC+1        | Direct Offset         |    R     |
    |       (2) 2a  |  PBR,PC+1        | Internal Operation    |    R     |
    |           3   |  PBR,PC+1        | Internal Operation    |    R     |
    |           4   |  0,D+DO+I        | Data Low              |   R/W    |
    |       (1) 4a  |  0,D+DO+I+1      | Data High             |   R/W    |
    +---------------+------------------+-----------------------+----------+
    (1) Add 1 cycle for M=0 or X=0 (i.e. 16 bit data).
    (2) Add 1 cycle for direct register low (DL) not equal 0.

    See also: Abbreviations