Intel 80286 User Manual

TABLE OF CONTENTS
CHAPTER 1 Page
INTRODUCTION TO THE 80286
General Attributes ... ....... .... ........... ....... ..................... .... ........... ....... ....... ..... ...... ............. 1-1
Modes of Operation . ......... ..... ..... ................. ..... .............................. ....... ..... ...... ............. 1-2
Advanced Features ........................................................................................................ 1-2
Memory Management ................................................................................................. 1-2
Task Management ...................................................................................................... 1-3
Protection Mechanisms .............................................................................................. 1-3
Support for Operating Systems ................................................................................. 1-4
Organization
of This Book ............................................. ................................................ 1-4
Related Publications ..... .............. ..... ......... ........................... ........... ......... ............. .......... 1-6
CHAPTER 2
80286 BASE ARCHITECTURE
Memory Organization and Segmentation ...................................................................... 2-1
Data Types ............................................... ......................................................... ............. 2-1
Registers ......................................................................................................................... 2-7
General Registers ....................................................................................................... 2-7
Memory Segmentation and Segment Registers .......... ,............................................. 2-8
Index, Pointer, and Base Registers ........................................................................... 2-9
Status and Control Registers ..................................................................................... 2-14
Addressing Modes ......................................................................................................... 2-16
Operands ..................................... .................................................... ........................... 2-16
Register and
Immediate Modes ................................................................ ................. 2-17
Memory Addressing Modes ....................................................................................... 2-17
Segment
Selection ........................ ............................................................ .............. 2-18
Offset Computation ................................................................................................. 2-19
Memory Mode ......................................................................................................... 2-20
Input/Output ...................................................................................................................
2-21
I/O Address Space ................................................................... ....... ............. .............. 2-23
Memory-Mapped I/O .................................................................................................. 2-23
Interrupts and Exceptions .............................................................................................. 2-24
Hierarchy of Instruction Sets ......................................................................................... 2-25
CHAPTER 3
BASIC INSTRUCTION SET
Data Movement Instructions .......................................................................................... 3-1
General-Purpose Data Movement Instructions ......................................................... 3-1
Stack Manipulation Instructions ................................................................................. 3-2
Flag Operation with the Basic Instruction Set ............................................................... 3-4
Status Flags ................................................................................................................ 3-4
Control Flags ............................................................................................................... 3-4
Arithmetic Instructions ................................................................................................... 3-5
Addition Instructions ................................................................................................... 3-7
Subtraction Instructions ............................................................................................. 3-7
Multiplication Instructions ........................................................................................... 3-8
Division Instructions ................................................................................................... 3-9
Logical Instructions ........................................................................................................ 3-9
Boolean Operation Instructions ................................................................................. 3-9
Shift and Rotate Instructions ...................................................................................... 3-10
Shift Instructions ..................................................................................................... 3-10
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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