Motorola MC68340 ユーザーズマニュアル
MOTOROLA
MC68340 USER’S MANUAL
5- 39
5.5.1 Exception Vectors
An exception vector is the address of a routine that handles an exception. The VBR
contains the base address of a 1024-byte exception vector table, which consists of 256
exception vectors. Sixty-four vectors are defined by the processor, and 192 vectors are
reserved for user definition as interrupt vectors. Except for the reset vector which is two
long words, each vector in the table is one long word. Refer to Table 5-16 for information
on vector assignment.
contains the base address of a 1024-byte exception vector table, which consists of 256
exception vectors. Sixty-four vectors are defined by the processor, and 192 vectors are
reserved for user definition as interrupt vectors. Except for the reset vector which is two
long words, each vector in the table is one long word. Refer to Table 5-16 for information
on vector assignment.
Table 5-16. Exception Vector Assignments
Vector Offset
Vector Number
Dec
Hex
Space
Assignment
0
0
000
SP
Reset: Initial Stack Pointer
1
4
004
SP
Reset: Initial Program Counter
2
8
008
SD
Bus Error
3
12
00C
SD
Address Error
4
16
010
SD
Illegal Instruction
5
20
014
SD
Zero Division
6
24
018
SD
CHK, CHK2 Instructions
7
28
01C
SD
TRAPcc, TRAPV Instructions
8
32
020
SD
Privilege Violation
9
36
024
SD
Trace
10
40
028
SD
Line 1010 Emulator
11
44
02C
SD
Line 1111 Emulator
12
48
030
SD
Hardware Breakpoint
13
52
034
SD
(Reserved for Coprocessor Protocol Violation)
14
56
038
SD
Format Error
15
60
03C
SD
Uninitialized Interrupt
16–23
64
92
92
040
05C
SD
(Unassigned, Reserved)
—
—
24
96
060
SD
Spurious Interrupt
25
100
064
SD
Level 1 Interrupt Autovector
26
104
068
SD
Level 2 Interrupt Autovector
27
108
06C
SD
Level 3 Interrupt Autovector
28
112
070
SD
Level 4 Interrupt Autovector
29
116
074
SD
Level 5 Interrupt Autovector
30
120
078
SD
Level 6 Interrupt Autovector
31
124
07C
SD
Level 7 Interrupt Autovector
32–47
128
188
188
080
0BC
SD
Trap Instruction Vectors (0–15)
—
—
48–58
192
232
232
0C0
0E8
0E8
SD
(Reserved for Coprocessor)
—
—
59–63
236
252
252
0EC
0FC
SD
(Unassigned, Reserved)
—
64–255
256
1020
100
3FC
SD
User-Defined Vectors (192)
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Freescale Semiconductor, Inc.
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