HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 115
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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5.5
5.5.1
Exception processing can be triggered by trap instruction, illegal slot instructions, and general
illegal instructions, as shown in table 5.9.
Table 5.9
5.5.2
When a TRAPA instruction is executed, trap instruction exception processing 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
3. The start address of the exception service routine is fetched from the exception processing
Type
Trap instruction
Illegal slot
instructions
General illegal
instructions
instruction to be executed after the TRAPA instruction.
vector table that corresponds to the vector number specified in the TRAPA instruction. That
address is jumped to and the program starts executing. The jump in this case is not a delayed
branch.
Exceptions Triggered by Instructions
Types of Exceptions Triggered by Instructions
Trap Instructions
Types of Exceptions Triggered by Instructions
Source Instruction
TRAPA
Undefined code placed
immediately after a delayed
branch instruction (delay slot) or
instructions that rewrite the PC
Undefined code anywhere
besides in a delay slot
Comment
—
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
—
Rev.4.00 Mar. 27, 2008 Page 71 of 882
5. Exception Processing
REJ09B0108-0400
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