Motorola MC68030 User Manual

Data Organization and Addressing Capabilities
2-24 MC68030 USER’S MANUAL MOTOROLA
Table 2–2 shows the categories to which each of the effective addressing modes belong.
These categories are sometimes combined, forming new categories that are more
restrictive. Two combined classifications are alterable memory or data alterable. The former
refers to those addressing modes that are both alterable and memory addresses, and the
latter refers to addressing modes that are both data and alterable.
2.6 PROGRAMMER`S VIEW OF ADDRESSING MODES
Extensions to the indexed addressing modes, indirection, and full 32-bit displacements
provide additional programming capabilities for both the MC68020 and the MC68030. This
section describes addressing techniques that exploit these capabilities and summarizes the
addressing modes from a programming point of view.
Addressing Modes Mode Register Data Memory Control Alterable
Assembler
Syntax
Data Register Direct 000 reg. no. X — — X Dn
Address Register Direct 001 reg. no. — — — X An
Address Register Indirect
Address Register Indirect
with Postincrement
Address Register Indirect
with Predecrement
Address Register Indirect
with Displacement
010
011
100
101
reg. no
reg. no.
reg. no.
reg. no.
X
X
X
X
X
X
X
X
X
—
—
X
X
X
X
X
(An)
(An)+
-(An)
(d
16
,An)
Address Register Indirect with
Index (8-Bit Displacement)
Address Register Indirect with
Index (Base Displacement)
Memory Indirect Postindexed
Memory Indirect Preindexed
110
110
110
110
reg. no.
reg. no.
reg. no
reg. no.
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(d
8
,An,Xn)
(bd,An,Xn)
([bd,An],Xn,od)
([bd,An,Xn],od)
Absolute Short
Absolute Long
111
111
000
001
X
X
X
X
X
X
X
X
(xxx).W
(xxx).L
Program Counter Indirect
with Displacement
Program Counter Indirect
with Index (8-Bit) Displacement
Program Counter Indirect
with Index (Base Displacement)
PC Memory Indirect
Postindexed
PC Memory Indirect
Preindexed
111
111
111
111
111
010
011
011
011
011
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
—
—
—
—
—
(d
16
,PC)
(d
8
,PC,Xn)
(bd,PC,Xn)
([bd,PC],Xn,od)
([bd,PC,Xn],od)
Immediate 111 100 X X — — #〈data〉

Motorola MC68030 Specifications

General

Brand	Motorola
Model	MC68030
Category	Computer Hardware
Language	English