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QB-V850MINIL, QB-V850MINI Emulator
6.
Cautions
This chapter lists cautions on using QB-V850MINIL or QB-V850MINI.
Caution items are classified in the following three categories, so refer to the relevant items.
[OCD]
Cautions for performing on-chip debugging
[IE]
Cautions for performing debugging with in-circuit method
[SC]
Cautions for performing self-testing
No.
Classification
1
[OCD]
2
[OCD]
3
[OCD], [IE]
4
[OCD], [IE]
[OCD], [IE]
5
6
[OCD]
7
[OCD]
8
[OCD]
9
[OCD]
[OCD]
10
11
[OCD], [IE]
[OCD], [IE]
12
13
[OCD]
R20UT0221EJ0400 Rev.4.00
2013.08.30
Table 6-1. List of Cautions (1/2)
Use of target devices used for on-chip debugging as mass production products is not guaranteed.
Guarantee for the case where only downloading of a program is performed but debugging is not
performed is planned.
In a target device that incorporates an OCD unit, some of the target interface signal pins for OCD
may have alternate functions. The alternate functions of these pins cannot be used during on-chip
debugging.
When erasure and write are prohibited by setting the security flag for the flash memory, programs
cannot be downloaded via the debugger.
If DMA transfer to the internal RAM is performed while a program is being downloaded to the flash
memory, downloading of the program may not be performed normally because the integrated
debugger uses the internal RAM during program downloading.
Do not use the ROM correction function or else unexpected breaks will occur.
Since the initial value of the ASID register in the V850E1 Series is undefined, set the ASID register
to 00H via the reset routine. Initialization of the V850ES Series is not required.
The current consumption in the target device increases during debugging compared with that in
normal operation mode, because the OCD unit of the target device operates during debugging.
The break function may malfunctions when a reset occurs during RUN (program execution),
depending on the target device. See the documents of the target device (user's manual,
restriction notification, etc.).
The I/O buffer (port pin) may enter the reset status depending on the target device when a reset is
input from the pin, even if reset is masked by the mask function. See the documents of the target
device (user's manual, restriction notification, etc.).
No break occurs in an interrupt service routine for an interrupt acknowledged during self
programming, even if an event breakpoint has been set.
When using the self programming function, set the debugger so that the clock for the peripheral
macros does not stop during breaks; otherwise, the flash memory may be damaged.
When using the self programming function, do not set software breaks to the ROM area; otherwise,
an unexpected break may occur.
With the V850E1 Series, a forced break may be executed via the debugger operation during flash
self writing. After a forced break, reexecute the program via the debugger or reset the CPU.
Caution
6. Cautions
Page 74 of 86
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