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OVERVIEW OF THE 80C186 FAMILY ARCHITECTURE
2-40
Figure 2-25. Interrupt Vector Table
When an interrupt is acknowledged, a common event sequence (Figure 2-26) allows the proces-
sor to execute the interrupt service routine.
1. The processor saves a partial machine status by pushing the Processor Status Word onto
the stack.
Memory
Address
Table
Entry
Vector
Definition
Type 255
User
Available
Reserved
Type 32
Type 31
CS =Code Segment Value
IP = Instruction Pointer Value
Type 20
2 Bytes
3FE
3FC
82
80
7E
7C
52
50
4E
4C
4A
48
46
44
42
40
3E
3C
3A
38
36
34
32
30
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
Type 11 - DMA1
2E
2C
2A
28
26
24
22
20
1E
1C
1A
18
16
14
12
10
0E
0C
0A
08
06
04
02
00
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
CS
IP
2 Bytes
Type 19 - Timer 2
Type 18 - Timer 1
Type 17 - Reserved
Type 16 - Numerics
Type 15 - INT3
Type 14 - INT2
Type 10 - DMA0
Type 9 - Reserved
Type 8 - Timer 0
Type 7 - ESC Opcode
Type 6 - Unused
Opcode
Type 5 - Array
Bounds
Type 4 - Overflow
Type 3 - Breakpoint
Type 2 - NMI
Type 1 - Single-Step
Type 0 - Divide Error
Memory
Address
Table
Entry
Vector
Definition
Type 13 - INT1
Type 12 - INT0
A1009-02