Intel Webcam 253668-032US User Manual

Vol. 3   6-3

INTERRUPT AND EXCEPTION HANDLING

(see Section 6.2, “Exception and Interrupt Vectors”). Asserting the NMI pin signals a 
non-maskable interrupt (NMI), which is assigned to interrupt vector 2.

Table 6-1.  Protected-Mode Exceptions and Interrupts  

Vector 

No.

Mne-

monic

Description

Type

Error 

Code

Source

 0

#DE

Divide Error

Fault

No

DIV and IDIV instructions.

 1

#DB

RESERVED

Fault/ 

Trap

No

For Intel use only.

 2

—

NMI Interrupt

Interrupt

No

Nonmaskable external 

interrupt.

 3

#BP

Breakpoint

Trap

No

INT 3 instruction.

 4

#OF

Overflow

Trap

No

INTO instruction.

 5

#BR

BOUND Range Exceeded

Fault

No

BOUND instruction.

 6

#UD

Invalid Opcode (Undefined 

Opcode)

Fault

No

UD2 instruction or reserved 

opcode.

1

 7

#NM

Device Not Available (No 

Math Coprocessor)

Fault

No

Floating-point or WAIT/FWAIT 

instruction.

 8

#DF

Double Fault

Abort

Yes 

(zero)

Any instruction that can 

generate an exception, an NMI, 

or an INTR.

 9

Coprocessor Segment 

Overrun (reserved)

Fault

No

Floating-point instruction.

2

10

#TS

Invalid TSS

Fault

Yes

Task switch or TSS access.

11

#NP

Segment Not Present

Fault

Yes

Loading segment registers or 

accessing system segments.

12

#SS

Stack-Segment Fault

Fault

Yes

Stack operations and SS 

register loads.

13

#GP

General Protection

Fault

Yes

Any memory reference and 

other protection checks.

14

#PF

Page Fault

Fault

Yes

Any memory reference.

15

—

(Intel reserved. Do not 

use.)

No

16

#MF

x87 FPU Floating-Point 

Error (Math Fault)

Fault

No

x87 FPU floating-point or 

WAIT/FWAIT instruction.

17

#AC

Alignment Check

Fault

Yes 

(Zero)

Any data reference in 

memory.

3