     65816 Addressing mode: Block Move Negative (backward) -- xyc

     (MVN)
     (3 bytes)   (7 cycles)

        +---------------+------------------+-----------------------+----------+
        |     Cycle     |   Address Bus    |       Data Bus        |Read/Write|
        +---------------+------------------+-----------------------+----------+
        |        +- 1   |  PBR,PC          | Op Code               |    R     |
        |        |  2   |  PBR,PC+1        | Dest. Bank Address    |    R     |
        |        |  3   |  PBR,PC+2        | Source Bank Address   |    R     |
        |   N-2  |  4   |  SBA,X           | Source Data           |    R     |
        |   Byte |  5   |  DBA,Y           | Dest Data             |    W     |
        |   C=2  |  6   |  DBA,Y           | Internal Operation    |    R     |
        |        +- 7   |  DBA,Y           | Internal Operation    |    R     |
        |        +- 1   |  PBR,PC          | Op Code               |    R     |
        |        |  2   |  PBR,PC+1        | Dest. Bank Address    |    R     |
        |   N-1  |  3   |  PBR,PC+2        | Source Bank Address   |    R     |
        |   Byte |  4   |  SBA,X+1         | Source Data           |    R     |
        |   C=1  |  5   |  DBA,Y+1         | Dest Data             |    W     |
        |        |  6   |  DBA,Y+1         | Internal Operation    |    R     |
        |        +- 7   |  DBA,Y+1         | Internal Operation    |    R     |
        |        +- 1   |  PBR,PC          | Op Code               |    R     |
        |        |  2   |  PBR,PC+1        | Dest. Bank Address    |    R     |
        | N Byte |  3   |  PBR,PC+2        | Source Bank Address   |    R     |
        |   Last |  4   |  SBA,X+2         | Source Data           |    R     |
        |   C=0  |  5   |  DBA,Y+2         | Dest Data             |    W     |
        |        |  6   |  DBA,Y+2         | Internal Operation    |    R     |
        |        |  7   |  DBA,Y+2         | Internal Operation    |    R     |
        |        +- 1   |  PBR,PC+3        | New Op Code           |    R     |
        +---------------+------------------+-----------------------+----------+

        See also: Abbreviations

       x = Source Address
       y = Destination
       c = Number of Bytes to move -1
       x,y Increment
       MVN is used when the destination start address is lower (more negative)
       than the source start address.

       FFFFFF
         |  Source End
         |  Dest End
         |  Source Start
         v  Dest Start
       000000