Intel 80286 User Manual

THE 80286 U\lSTRUCTION SET
Ir Instruction Byte Format
"mod" Field Bit Assignments
mod
Displacement
00
DISP - 0(2), disp-Iow and disp-high are absent
01 OISP - disp-Iow sign-extended to 16-bits, disp-high is absent
10 OISP - disp-high; disp-Iow
11 rIm is treated as a "reg" field
"r" Field Bit Assignments
16-Blt (w - 1) B-Blt (w - 0)
Segment
000
AX 000 AL
001 CX 001 CL
010
OX 010 OL
011 BX 011 BL
100
SP 100 AH
101 BP 101 CH
110 SI 1100H
111 01 111 BH
"rim" Field Bit Assignments
rim
000
001
010
'011
100
101
110
111
OISP follows 2nd byte of ,instruction (before data if required).
NOTES:
, ,1. Opcode indicates presence and size of immediate field.
Operand Address
(BX) + (SI) + OISP
(BX) + (01) + OISP
(BP) + (SI) + OISP
(BP) + (01) + OISP
(SI) +OISP
(01) + OISP
(BP) + 0ISP(2)
(BX) + OISP
2. Except If mod-OO and r/m-110 then EA-disp-high: disp-Iow.
Figure B-2_ Ir Instruction Byte Format
8-4
00 ES
01 CS
10 SS
11 OS
pcjs.org

Intel 80286 Specifications

General

Processor Type	Microprocessor
Clock Speed	6 MHz to 25 MHz
Transistor Count	134, 000
Addressable Memory	16 MB
Instruction Set	x86
Architecture	x86
Data Bus Width	16-bit
Address Bus Width	24-bit
Operating Modes	Real mode, Protected mode
Process Technology	1.5 µm
Voltage	5V
Introduced	1982
Package	68-pin PGA