HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 719

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

25.4
1. The CPU can read from or write to the UBC registers via the I bus. Accordingly, during the
2. UBC cannot monitor access to the L bus and I bus in the same channel.
3. Note on specification of sequential break:
4. When a user break and another exception occur at the same instruction, which has higher
5. Note the following exception for the above note.
6. Note the following when a break occurs in a delay slot.
7. User breaks are disabled during UBC module standby mode. Do not read from or write to the
8. When the repeat loop of the DSP extended function is used, even though a break condition is
period from executing an instruction to rewrite the UBC register till the new value is actually
rewritten, the desired break may not occur. In order to know the timing when the UBC register
is changed, read from the last written register. Instructions after then are valid for the newly
written register value.
A condition match occurs when a B-channel match occurs in a bus cycle after an A-channel
match occurs in another bus cycle in sequential break setting. Therefore, no break occurs even
if a bus cycle, in which an A-channel match and a channel B match occur simultaneously, is
set.
priority is determined according to the priority levels defined in table 4.1 in section 4,
Exception Handling. If an exception with higher priority occurs, the user break is not
generated.
 Pre-execution break has the highest priority.
 When a post-execution break or data access break occurs simultaneously with a re-
 When a post-execution break or data access break occurs simultaneously with a
If a post-execution break or data access break is satisfied by an instruction that generates a
CPU address error by data access, the CPU address error is given priority to the break. Note
that the UBC condition match flag is set in this case.
If a pre-execution break is set at the delay slot instruction of the RTE instruction, the break
does not occur until the branch destination of the RTE instruction.
UBC registers during UBC module standby mode; the values are not guaranteed.
satisfied during execution of the entire repeat loop or several instructions in the repeat loop, the
break may be held. For details, see section 4, Exception Handling.
execution-type exception (including pre-execution break) that has higher priority, the re-
execution-type exception is accepted, and the condition match flag is not set (see the
exception in the following note). The break will occur and the condition match flag will be
set only after the exception source of the re-execution-type exception has been cleared by
the exception handling routine and re-execution of the same instruction has ended.
completion-type exception (TRAPA) that has higher priority, though a break does not
occur, the condition match flag is set.
Usage Notes
Rev. 1.00, 02/04, page 681 of 804