Address Register Indirect With Index (Base Displacement) Mode - Motorola MC68030 User Manual

2.4.8 Address Register Indirect with Index (Base Displacement) Mode

This addressing mode requires an index register indicator and an optional 16- or 32-bit sign-
extended base displacement. The index register indicator includes size and scaling
information. The operand is in memory. The address of the operand is the sum of the
contents of the address register, the scaled contents of the sign-extended index register,
and the base displacement.
In this mode, the address register, the index register, and the displacement are all optional.
If none is specified, the effective address is zero. This mode provides a data register indirect
address when no address register is specified and the index register is a data register (Dn).
GENERATION:
ASSEMBLER SYNTAX:
MODE:
REGISTER:
ADDRESS REGISTER:
BASE DISPLACEMENT:
INDEX REGISTER:
SCALE:
MEMORY ADDRESS:
NUMBER OF EXTENSION WORDS:
MOTOROLA
EA = (An) + (Xn) + bd
(bd,An,Xn.SIZE*SCALE)
110
n
An
31
SIGN-EXTENDED VALUE
31
SIGN-EXTENDED VALUE
7
1,2, OR 3
MC68030 USER'S MANUAL
Data Organization and Addressing Capabilities
31
MEMORY ADDRESS
0
0
0
SCALE VALUE X
31
OPERAND
0
+
+
0
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