Intel 80286 User Manual

15
,
PROTECTION
MEMORY
CPU
I'
LIT-
15
0
I
·
·
GOT LIMIT
I--
·
23
I
I
GOT BASE
1
GOTR
--
15
--
0
LOTR
I
LOT
LOT,
SELECTOR
-r
r - -15 --- "0 -, I
·
I
·
I
I
·
J
r-;
I
I
LOT LIMIT
-I
23
I
l
..J
I
LOT BASE
I
I
LOT
n
I
PROGRAM INVISIBLE
I
I
I
CURRENl
LOT
L ________ ....I
·
·
·
Figure 7-4. Local and Global Descriptor Table Definitions
3 2
o
T
I E
INDEX
I
0
X
T T
I
L
means that an event external to
the program caused the exception
(i.e., external interrupt, single step,
processor extension error)
o means that an exception occurred
while processing the instructloft at
CS:IP saved on stack.
1 means use
lOT and ignore bit 2.
o means
bit 2 indicates table usage
o means use GOT
:
1
means use LOT
'-------------_ Entry in lOT, GOT, or LOT
Figure 7-5. Error Code Format (on the stack)
7-7
G30108
G30108
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