Transfer is made between a data register and alternate bytes of memory at the selected address which must be specified in indirect mode with a 16-bit displacement. This instruction is of use with 8 bits peripheral programming.
LEA port0,A0 ; A0 -> $FFFFFFFFFFFFFFFF MOVEQ #0,D0 MOVEP.L D0,(0,A0) ; A0 -> $FF00FF00FF00FF00 MOVE.L #$55554444,D0 MOVEP.L D0,(1,A0) ; A0 -> $FF55FF55FF44FF44
----------------------------------------------------------------- |15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |---|---|---|---|-----------|-----------|---|---|---|-----------| | 0 | 0 | 0 | 0 |Dx REGISTER| OP-MODE | 0 | 0 | 1 |Ay REGISTER| |---------------------------------------------------------------| | 16 BITS OFFSET | ----------------------------------------------------------------- OP-MODE 100->16 bits move, memory to register 101->32 bits move, memory to register 110->16 bits move, register to memory 111->32 bits move, register to memory REGISTER Dx register specifies the number of data register. Ay register specifies the number of address register which takes place in indirect addressing with displacement.