SH7720 Datasheet, PDF (303/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 7 Exception Handling
7.5 Usage Notes
1. An instruction assigned at a delay slot of the RTE instruction is executed after the contents of
the SSR is restored into the SR. An acceptance of an exception related to instruction access is
determined according to the SR before restore. An acceptance of other exceptions is
determined by processing mode of the SR after restore, and BL bit value. A processing-
completion type exception is accepted before an instruction at the RTE branch destination
address is executed. However, note that the correct operation cannot be guaranteed if a re-
execution type exception occurs.
2. In an instruction assigned at a delay slot of the RTE instruction, a user break cannot be
accepted.
3. If the MD and BL bits of the SR register are changed by the LDC instruction, an exception is
accepted according to the changed SR value from the next instruction.* A processing-
completion type exception is accepted before the next instruction is executed. An interrupt
and DMA address error in re-execution type exceptions are accepted before the next
instruction is executed.
Note: * If an LDC instruction is executed for the SR, the following instructions are re-fetched
and an instruction fetch exception is accepted according to the modified SR value.
Rev. 3.00 Jan. 18, 2008 Page 241 of 1458
REJ09B0033-0300