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MC68302FC16 Datasheet(PDF) 39 Page - Motorola, Inc |
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MC68302FC16 Datasheet(HTML) 39 Page - Motorola, Inc |
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39 / 480 page  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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