SH7125_08 Datasheet, PDF (91/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 5 Exception Handling
Section 5 Exception Handling
5.1 Overview
5.1.1 Types of Exception Handling and Priority
Exception handling is started by four sources: resets, address errors, interrupts and instructions and
have the priority, as shown in table 5.1. When several exceptions are detected at once, they are
processed according to the priority.
Table 5.1 Types of Exceptions and Priority
Exception
Exception Source
Priority
Reset
Power-on reset
High
Manual reset
Interrupt
User break (break before instruction execution)
Address error CPU address error (instruction fetch)
Instruction
General illegal instructions (undefined code)
Illegal slot instruction (undefined code placed immediately after a
delayed branch instruction*¹ or instruction that changes the PC value*²)
Trap instruction (TRAPA instruction)
Address error CPU address error (data access)
Interrupt
User break (break after instruction execution or operand break)
NMI
IRQ
On-chip peripheral modules
Low
Notes: 1. Delayed branch instructions: JMP, JSR, BRA, BSR, RTS, RTE, BF/S, BT/S, BSRF, and
BRAF.
2. Instructions that change the PC value: JMP, JSR, BRA, BSR, RTS, RTE, BT, BF,
TRAPA, BF/S, BT/S, BSRF, BRAF, LDC Rm,SR, LDC.L @Rm+,SR.
Rev. 4.00 Jul. 25, 2008 Page 71 of 750
REJ09B0243-0400