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Addressing Capabilities 2.2.6 Address Register Indirect with Displacement Mode In the address register indirect with displacement mode, the operand is in memory. The sum of the address in the address register, which the effective address specifies, plus the signextended 16-bit displacement integer in the extension word is the operand’s address in memory. Displacements are always sign-extended to 32 bits prior to being used in effective address calculations. . GENERATION: ASSEMBLER SYNTAX: EA MODE FIELD: EA REGISTER FIELD: NUMBER OF EXTENSION WORDS: EA = (An) + d16 (d16,An) 101 REG. NO. 1 31 0 CONTENTS ADDRESS REGISTER 31 0 15 SIGN EXTENDED DISPLACEMENT INTEGER + 31 OPERAND POINTER 0 CONTENTS POINTS TO MEMORY 2-8 OPERAND M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL MOTOROLA
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