參數(shù)資料
型號(hào)： EC000UM
英文描述： EC000 Core User＇s Manual (SCM68000)
中文描述： EC000核心用戶手冊(cè)（SCM68000）
文件頁(yè)數(shù)： 61/145頁(yè)
文件大?。?/td> 829K
代理商： EC000UM
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Overview
MOTOROLA
EC000 CORE PROCESSOR USER’S MANUAL
1-9
1.4 DATA TYPES AND ADDRESSING MODES
Detailed information about the data types and addressing modes can be found in the
M68000 Family Programmer's Reference Manual (M68000PM/AD). The SCM68000 sup-
ports the five basic data types of the M68000 family:
1. Bit
2. Binary-Coded-Decimal (BCD) Digit (4 Bits)
3. Byte (8 Bits)
4. Word (16 Bits)
5. Long Word (32 Bits)
In addition, the instruction set supports operations on other data formats such as memory
addresses, status word, data, etc.
The SCM68000 also supports the basic addressing modes of the M68000 family. The reg-
ister indirect addressing modes support postincrementing, predecrementing, offsetting, and
indexing capabilities. The program counter relative mode also supports indexing and offset-
ting. Table 1-1 lists a summary of the data addressing modes for the SCM68000.
Table 1-1. Data Addressing Modes
Addressing Modes
Generation
Syntax
Register Direct Addressing
Data Register Direct
Address Register Direct
EA = Dn
EA = An
Dn
An
Absolute Data Addressing
Absolute Short
Absolute Long
EA = (Next Word)
EA = (Next Two Words)
(xxx).W
(xxx).L
Program Counter Relative Addressing
Relative with Offset
Relative with Index and Offset
EA = (PC) + d16
EA = (PC) + d8
(d16,PC)
(d8,PC,Xn)
Register Indirect Addressing
Register Indirect
Postincrement Register Indirect
Predecrement Register Indirect
Register Indirect with Offset
Indexed Register Indirect with Offset
EA = (An)
EA = (An), An
← An + N
An
← An – N, EA = (An)
EA = (An) + d16
EA = (An) + (Xn) + d8
(An)
(An)+
–(An)
(d16,An)
(d8,An,Xn)
Immediate Data Addressing
Immediate
Quick Immediate
DATA = Next Word(s)
Inherent Data
#<data>
Implied Addressing
Implied Register
EA = SR, USP, SSP, PC
SR, USP, SSP, PC
NOTES:
EA
=
Effective Address
Dn
=
Data Register
An
=
Address Register
( )
=
Contents of
PC
=
Program Counter
d8
=
8-Bit Offset (Displacement)
d16
=
16-Bit Offset (Displacement)
N
=
1 for byte, 2 for word, and 4 for long word. If An is the stack pointer and the
operand size is byte, N = 2 to keep the stack pointer on a word boundary.
←
=
Replaces
Xn
=
Address or Data Register Used as Index Register
SR
=
Status Register
USP
=
User Stack Pointer
SSP
=
Supervisor Stack Pointer
(xxx)
=
Absolute Address
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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