Intel 386 User Manual

E-5
INSTRUCTION SET SUMMARY
SUB = Subtract
register from register 0 0 1 0 1 0 d w mod reg r/m 2 2
register from memory 0 0 1 0 1 0 0 w mod reg r/m 7** 7** b h
memory from register 0 0 1 0 1 0 1 w mod reg r/m 6* 6* b h
immediate from
register/memory
1 0 0 0 0 0 s w mod 101 r/m immediate data
2/7** 2/7** b h
immediate from accu-
mulator (short form)
0 0 1 0 1 1 0 w immediate data
22
SBB = Subtract with borrow
register from register 0 0 0 1 1 0 d w mod reg r/m 2 2
register from memory 0 0 0 1 1 0 0 w mod reg r/m 7** 7** b h
memory from register 0 0 0 1 1 0 1 w mod reg r/m 6* 6* b h
immediate from
register/memory
1 0 0 0 0 0 s w mod 0 1 1 r/m immediate data
2/7** 2/7** b h
immediate from accu-
mulator (short form)
0 0 0 1 1 1 0 w immediate data
22
DEC = Decrement
register/memory 1 1 1 1 1 1 1 w reg 0 0 1 r/m 2/6 2/6 b h
register (short form) 0 1 0 0 1 reg 2 2
CMP = Compare
register with register 0 0 1 1 1 0 d w mod reg r/m 2 2
memory with register 0 0 1 1 1 0 0 w mod reg r/m 5* 5* b h
register with memory 0 0 1 1 1 0 1 w mod reg r/m 6* 6* b h
immediate with
register/memory
1 0 0 0 0 0 s w mod 1 1 1 r/m
immediate
data
2/5* 2/5* b h
immediate with accu-
mulator (short form)
0 0 1 1 1 1 0 w
immediate
data
22
NEG = Change sign 1 1 1 1 0 1 1 w mod 0 1 1 r/m 2/6* 2/6* b h
AAA = ASCII adjust for
addition
0 0 1 1 0 1 1 1
44
AAS = ASCII adjust for
subtraction
0 0 1 1 1 1 1 1
44
DAA = Decimal adjust
for addition
0 0 1 0 0 1 1 1
44
DAS = Decimal adjust for
subtraction
0 0 1 0 1 1 1 1
44
Table E-1. Instruction Set Summary (Sheet 4 of 19)
Instruction Format
Clock Count Notes
Real
Ad-
dress
Mode
or
Virtual
8086
Mode
Pro-
tected
Virtual
Ad-
dress
Mode
Real
Ad-
dress
Mode
or
Virtual
8086
Mode
Pro-
tected
Virtual
Ad-
dress
Mode

Intel 386 Specifications

General

Architecture	x86
Clock Speed	12 MHz to 40 MHz
Transistor Count	275, 000
Data Bus Width	32-bit
Address Bus Width	32-bit
Instruction Set	x86
Introduced	1985
Maximum Memory	4 GB
Operating Modes	Real mode, Protected mode, Virtual 8086 mode
MMU	Yes
Voltage	5V
Model	Intel 386
Package	PGA
Process	1.5 μm to 1 μm