SH7708 Datasheet, PDF (158/633 Pages) Renesas Technology Corp – SuperH™ RISC engine

7.3.6 Cautions
1. If pre-execution is specified for one channel and post-execution for the other for the same
address, a pre-execution break will be generated but the condition match flag will be set for
both channels.
2. Do not set consecutive PC breaks for a delayed branch instruction and a delay slot instruction.
3. If a PC break (post-execution condition) is set for the TRAPA instruction, the condition match
flag will be set but a break will not be executed. The TRAP instruction will be processed
correctly.
4. If data access (address + data) is set as a break condition, and an exception is generated by the
instruction (including the delay slot for a delayed branch instruction) following that at which
that break condition was matched, the condition match flag will be set but a break will not be
executed. The exception generated after the break will be processed correctly.
5. If data access (address + data) is set as a break condition, and the instruction following that at
which that break condition was matched is a SLEEP instruction, the condition match flag will
be set but a break will not be executed. The SLEEP instruction will be processed correctly.
6. If an instruction fetch (halt after execution) is set as a break condition, and a nonmaskable
interrupt is detected at the instruction following that at which that break condition was
matched, the condition match flag will be set but a break will not be executed. The
nonmaskable interrupt will be processed correctly.
7. When a sequential break setting is made, a condition match occurs on a channel B match in a
bus cycle after that in which a channel A match occurred. Therefore, a condition match will
not be recognized if bus cycles occurring simultaneously in channel A and B are designated.
Also, since the CPU has a pipeline structure, the order of instruction fetch and data access
cycles is determined by the pipeline. With sequential conditions, therefore, the sequential
conditions will be taken as being matched as long as the respective channel conditions match
in the order in which the bus cycles occur.
8. With an emulator, the UBC is used on the emulator system side in order to implement the
emulator’s break functions. Consequently, no UBC functions can be used when an emulator is
used.
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