Effective Address Encoding Summary - Motorola CPU32 Reference Manual

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3.4.4 Effective Address Encoding Summary
Most addressing modes use one of the three formats shown in Figure 3-2. The
single EA instruction is in the format of the instruction word. The mode field of
this word selects the addressing mode. The register field contains the general
register number or a value that selects the addressing mode when the mode
field contains "111 ".
Some indexed or indirect modes use the instruction word followed by the brief
format extension word. Other indexed or indirect modes consist of the
instruction word and the full format of extension words. The longest instruction
for the CPU32 contains six extension words. It is a MOVE instruction with full
format extension words for both source and destination EA and a 32-bit base
displacement for both addresses.
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DATA ORGANIZATION AND CPU32 REFERENCE MANUAL
ADDRESSING CAPABILITIES