SH7046 Datasheet, PDF (108/611 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7046 Series

Section 5 Exception Processing
5.6 Cases when Exception Sources Are Not Accepted
When an address error or interrupt is generated directly after a delayed branch instruction or
interrupt-disabled instruction, it is sometimes not accepted immediately but stored instead, as
shown in table 5.10. In this case, it will be accepted when an instruction that can accept the
exception is decoded.
Table 5.10 Generation of Exception Sources Immediately after a Delayed Branch
Instruction or Interrupt-Disabled Instruction
Exception Source
Point of Occurrence
Immediately after a delayed branch instruction^*1
Immediately after an interrupt-disabled instruction^*2
Address Error
Not accepted
Accepted
Interrupt
Not accepted
Not accepted
Notes: 1. Delayed branch instructions: JMP, JSR, BRA, BSR, RTS, RTE, BF/S, BT/S, BSRF, and
BRAF
2. Interrupt-disabled instructions: LDC, LDC.L, STC, STC.L, LDS, LDS.L, STS, and STS.L
5.6.1 Immediately after a Delayed Branch Instruction
When an instruction placed immediately after a delayed branch instruction (delay slot) is decoded,
neither address errors nor interrupts are accepted. The delayed branch instruction and the
instruction placed immediately after it (delay slot) are always executed consecutively, so no
exception processing occurs during this period.
5.6.2 Immediately after an Interrupt-Disabled Instruction
When an instruction placed immediately after an interrupt-disabled instruction is decoded,
interrupts are not accepted. Address errors can be accepted.
Rev. 4.00 Dec 05, 2005 page 64 of 564
REJ09B0270-0400