The term addressing mode refers to the way the processor specifies addresses of data items (or operands) being processed. The 68000 has a powerful range of addressing modes.
Clements, Section 2.3, describes addressing modes with many examples.
The Motorola 68000 Programmer's Reference Manual, Chapter 2, describes in some detail the available addressing modes.
The following table summarises the basic addressing modes.
| type | effective address | example |
| immediate | ||
| none | MOVE.L #$1A4E,D4 | |
| direct | ||
| register | EA=Rn | MOVE.L D0,D3 |
| absolute | EA=<address> | MOVE.L D0,$1234 |
| indirect | ||
| address register | EA=(An) | MOVE.L (A0),D3 |
| displacement | EA=(An) + <displacement> | MOVE.L 12(A0),D3 |
| index | EA=(An) + (Dn) + <displacement> | MOVE.L 9(A1,D0.W),D3 |
| predecrement | An = An - k, EA=(An) | MOVE.L -(A0),D3 |
| postincrement | EA=(An), An = An + k | MOVE.L (A0)+,D3 |
| PC relative with displacement | ||
| EA=(PC) + <displacement> | MOVE.L LABEL(PC),D5 |
ANU Engineering - ENGN3213