MC68020 查看數據表（PDF） - Freescale Semiconductor

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MC68020

MICROPROCESSORS USER’S MANUAL

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Table 1-1. Addressing Modes

Addressing Modes

Syntax

Register Direct

Data

Dn

Address

An

Register Indirect

Address

Address with Postincrement

Address with Predecrement

Address with Displacement

Address Register Indirect with Index

8-Bit Displacement

Base Displacement

(An)

(An)+

–(An)

(d 16 , An)

(d 8, An, Xn)

(bd, An, Xn)

Memory Indirect

Postindexed

Preindexed

([bd, An], Xn, od)

([bd, An, Xn], od)

PC Indirect with Displacement

PC Indirect with Index

8-Bit Displacement

Base Displacement

(d 16 , PC)

(d 8, PC, Xn)

(bd, PC, Xn)

PC Indirect

Postindexed

Preindexed

([bd, PC], Xn, od)

([bd, PC, Xn], od)

Absolute Data Addressing

Short

Long

(xxx).W

(xxx).L

Immediate

#<data >

NOTE:

Dn = Data Register, D7–D0

An = Address Register, A7–A0

d8, d16 = A twos complement or sign-extended displacement added as part

of the effective address calculation; size is 8 (d8) or 16 (d16 ) bits;

when omitted, assemblers use a value of zero.

Xn = Address or data register used as an index register; form is

Xn.SIZE *SCALE, where SIZE is .W or .L (indicates index register

size) and SCALE is 1, 2, 4, or 8 (index register is multiplied by

SCALE); use of SIZE and/or SCALE is optional.

bd = A twos-complement base displacement; when present, size can be

16 or 32 bits.

od = Outer displacement added as part of effective address calculation

after any memory indirection; use is optional with a size of 16 or 32

bits.

PC = Program Counter

<data> = Immediate value of 8, 16, or 32 bits

( ) = Effective Address

[ ] = Use as indirect access to long-word address.

MOTOROLA

M68020 USER’S MANUAL

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