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MC68302FC20 Datasheet(PDF) 39 Page - Motorola, Inc

Part No. MC68302FC20
Description  Integrated Multiprotocol Processor User’s Manual
Download  480 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MC68302FC20 Datasheet(HTML) 39 Page - Motorola, Inc

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MC68000/MC68008 Core
MOTOROLA
MC68302 USER’S MANUAL
2-9
NOTES:
1. Vector numbers 12–14, 16–23, and 48–63 are reserved for future enhancements by Motorola
(with vectors 60–63 being used by the M68302 (see 2.7 MC68302 IMP Configuration and
Control)). No user peripheral devices should be assigned these numbers.
2. Unlike the other vectors which only require two words, reset vector (0) requires four words and is
located in the supervisor program space.
3. The spurious interrupt vector is taken when there is a bus error indication during interrupt
processing.
4. TRAP # n uses vector number 32 + n.
2.4.2 Exception Stacking Order
Exception processing saves the most volatile portion of the current processor context on top
of the supervisor stack. This context is organized in a format called the exception stack
frame. The amount and type of information saved on the stack is determined by the type of
exception. The reset exception causes the M68000 to halt current execution and to read a
new SSP and PC as shown in Table 2-5. A bus error or address error causes the M68000
to store the information shown in Figure 2-3. The interrupts, traps, illegal instructions, and
trace stack frames are shown in Figure 2-4.
11
44
02C
SD
Line 1111 Emulator
121
48
030
SD
(Unassigned, Reserved)
131
52
034
SD
(Unassigned, Reserved)
141
56
038
SD
(Unassigned, Reserved)
15
60
03C
SD
Uninitialized Interrupt Vector
16–231
64
040
SD
(Unassigned, Reserved)
92
05C
SD
24
96
060
SD
Spurious Interrupt3
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
080
SD
TRAP Instruction Vectors4
188
0BC
SD
48–631
192
0C0
SD
(Unassigned, Reserved)
255
0FC
SD
64–255
256
100
SD
User Interrupt Vectors
1020
3FC
SD
Table 2-5. M68000 Exception Vector Assignment


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