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參數(shù)資料
| 型號： | intel386 DX |
| 廠商： | Intel Corp. |
| 英文描述： | 32-Bit CHMOS Microprocessor With Integrated Memory Management(32位CHMOS 微處理器帶集成存儲管理) |
| 中文描述： | 32位CHMOS微處理器集成內(nèi)存管理（32位CHMOS微處理器帶集成存儲管理） |
| 文件頁數(shù)： | 110/139頁 |
| 文件大?。?/td> | 1587K |
| 代理商： | INTEL386 DX |
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Intel386
TM
DX MICROPROCESSOR
6.2 INSTRUCTION ENCODING
6.2.1 Overview
All instruction encodings are subsets of the general
instruction format shown in Figure 6-1. Instructions
consist of one or two primary opcode bytes, possibly
an address specifier consisting of the ‘‘mod r/m’’
byte and ‘‘scaled index’’ byte, a displacement if re-
quired, and an immediate data field if required.
Within the primary opcode or opcodes, smaller en-
coding fields may be defined. These fields vary ac-
cording to the class of operation. The fields define
such information as direction of the operation, size
of the displacements, register encoding, or sign ex-
tension.
Almost all instructions referring to an operand in
memory have an addressing mode byte following
the primary opcode byte(s). This byte, the mod r/m
byte, specifies the address mode to be used. Certain
encodings of the mod r/m byte indicate a second
addressing byte, the scale-index-base byte, follows
the mod r/m byte to fully specify the addressing
mode.
Addressing modes can include a displacement im-
mediately following the mod r/m byte, or scaled in-
dex byte. If a displacement is present, the possible
sizes are 8, 16 or 32 bits.
If the instruction specifies an immediate operand,
the immediate operand follows any displacement
bytes. The immediate operand, if specified, is always
the last field of the instruction.
Figure 6-1 illustrates several of the fields that can
appear in an instruction, such as the mod field and
the r/m field, but the Figure does not show all fields.
Several smaller fields also appear in certain instruc-
tions, sometimes within the opcode bytes them-
selves. Table 6-2 is a complete list of all fields ap-
pearing in the Intel386 DX instruction set. Further
ahead, following Table 6-2, are detailed tables for
each field.
T T T T T T T T T T T T T T T T mod T T T r/m
X
opcode
(one or two bytes)
(T represents an
opcode bit.)
ss index base d32
l
16
l
8
l
none data32
l
16
l
8
l
none
7 6 5 3 2 0
YX
‘‘s-i-b’’
address
byte
displacement
(4, 2, 1 bytes
register and address
or none)
mode specifier
7
0 7
0
YX
7 6 5 3 2 0
‘‘mod r/m’’
byte
X
YX
Y X
Y
immediate
data
(4, 2, 1 bytes
or none)
Y
Figure 6-1. General Instruction Format
Table 6-2. Fields within Intel386
TM
DX Instructions
Field Name
Description
Number of Bits
w
d
s
reg
mod r/m
Specifies if Data is Byte or Full Size (Full Size is either 16 or 32 Bits
Specifies Direction of Data Operation
Specifies if an Immediate Data Field Must be Sign-Extended
General Register Specifier
Address Mode Specifier (Effective Address can be a General Register)
1
1
1
3
2 for mod;
3 for r/m
2
3
3
2
3
ss
index
base
sreg2
sreg3
tttn
Scale Factor for Scaled Index Address Mode
General Register to be used as Index Register
General Register to be used as Base Register
Segment Register Specifier for CS, SS, DS, ES
Segment Register Specifier for CS, SS, DS, ES, FS, GS
For Conditional Instructions, Specifies a Condition Asserted
or a Condition Negated
4
Note:
Table 6-1 shows encoding of individual instructions.
110
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| Intel386 EX | Highly Integrated, 32-Bit, Fully Static Embedded Micropocessor(32位高集成完全靜態(tài)嵌入式微處理器) |
| INTEL386 SXSA | 5-V 32-Bit Fully Static Embedded Microprocessor(5V，32位完全靜態(tài)嵌入式微處理器) |
| intel386 SX | 32-Bit CPU With a 16-Bit External Data Bus And a 24-bit External Address Bus(帶16位內(nèi)部數(shù)據(jù)總線和24位內(nèi)部地址總線32位微處理器) |
| INTEL386 | Intel386 EX Embedded Microprocessor |
| Intel387 dx | DX Math Coprocessor(32位數(shù)學協(xié)處理器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INTEL386SX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:MICROPROCESSOR |
| INTEL387 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel387TM SX MATH COPROCESSOR |
| INTEL387DX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Intel387 DX - MATH COPROCESSOR |
| INTEL387SX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel387 SX - MATH COPROCESSOR |
| INTEL387TMDX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel387TM DX MATH COPROCESSOR |
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