Section 4 Exception Handling
Rev. 2.00 Mar 09, 2006 page 137 of 906
REJ09B0292-0200
4.5
Exceptions Triggered by Instructions
4.5.1
Instruction-Triggered Exception Types
Exception handling can be triggered by a trap instruction, general illegal instruction or illegal slot
instruction, as shown in table 4.9.
Table 4.9
Types of Exceptions Triggered by Instructions
Type
Source Instruction
Comment
Trap instruction
TRAPA
—
Illegal slot
instruction
Undefined code placed
immediately after a delayed
branch instruction (delay slot)
and instructions that rewrite the
PC
Delayed branch instructions: JMP, JSR,
BRA, BSR, RTS, RTE, BF/S, BT/S, BSRF,
BRAF
Instructions that rewrite the PC: JMP, JSR,
BRA, BSR, RTS, RTE, BT, BF, TRAPA,
BF/S, BT/S, BSRF, BRAF
General illegal
instruction
Undefined code anywhere
besides in a delay slot
—
4.5.2
Trap Instructions
When a TRAPA instruction is executed, trap instruction exception handling starts. The CPU
operates as follows:
1. The status register (SR) is saved to the stack.
2. The program counter (PC) is saved to the stack. The PC value saved is the start address of the
instruction to be executed after the TRAPA instruction.
3. The exception service routine start address is fetched from the exception vector table entry that
corresponds to the vector number specified by the TRAPA instruction. That address is jumped
to and the program starts executing. The jump that occurs is not a delayed branch.
Содержание SH7616
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Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...