Motorola DigitalDNA ColdFire MCF5272 User Manual page 85

4 x vector_number. When the index value is generated, the vector table contents
determine the address of the first instruction of the desired handler. After the fetch
of the first opcode of the handler is initiated, exception processing terminates and
normal instruction processing continues in the handler.
ColdFire processors support a 1024-byte vector table aligned on any 1-Mbyte address
boundary; see Table 2-18. The table contains 256 exception vectors where the first 64 are
defined by Motorola; the remaining 192 are user-defined interrupt vectors.
Vector Numbers Vector Offset (Hex)
0
1
2
3
4
5
6–7
8
9
10
11
12
13
14
15
16–23
24
25–31
32–47
48–60
61
62–63
64–255
1
The term 'fault' refers to the PC of the instruction that caused the exception. The term 'next' refers to the PC
of the instruction that immediately follows the instruction that caused the fault.
ColdFire processors inhibit sampling for interrupts during the first instruction of all
exception handlers. This allows any handler to effectively disable interrupts, if necessary,
by raising the interrupt mask level contained in the status register.
Table 2-18. Exception Vector Assignments
Stacked Program Counter
000
004
008
00C
010
014
018–01C
020
024
028
02C
030
034
038
03C
040–05C
060
064–07C
080–0BC
0C0–0F0
0F4
0F8–0FC
100–3FC
Chapter 2. ColdFire Core
Exception Processing Overview
1
— Initial stack pointer
— Initial program counter
Fault Access error
Fault Address error
Fault Illegal instruction
Fault Divide by zero
— Reserved
Fault Privilege violation
Next Trace
Fault Unimplemented line-a opcode
Fault Unimplemented line-f opcode
Next Debug interrupt
— Reserved
Fault Format error
Next Uninitialized interrupt
— Reserved
Next Spurious interrupt
Next Level 1–7 autovectored interrupts
Next Trap #0–15 instructions
— Reserved
Fault Unsupported instruction
— Reserved
Next User-defined interrupts
Assignment
2-37