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3. Restrictions
■ Hardware restrictions
This section describes restrictions related to the hardware of this product.
■ Software restrictions
This section describes restrictions related to the software of this product.
Take note of the following restrictions when the pseudo power-on debug function is being used.
4
• This product isolates the evaluation MCU from the mode lines (MD[2:0]) of the user system.
The mode pin levels of the user system therefore cannot be checked from the emulator.
Take note of the following additional restrictions when the pseudo power-on debug function
is being used.
• When the user system is restarted, the emulator resources (break registers, etc.) are saved.
• Do not change the power switch on the pseudo power-on adapter during a reset (reset signal
from user system, turning off the power during power-on debugging, reset command from the
emulator, etc.).
• In order to implement the pseudo power-on debug function, the reset signal from the user sys-
tem is delayed by a maximum of 40ns on the pseudo power-on debug adapter. Other restric-
tions may apply to the reset signal when the emulator is being used. Refer to the operation
manual for the adapter or emulator for details.
• Because the MCU power supply does not fall below V
is applied to UVDDE, the voltage level of V
the user system may be exposed to electrical stress. Furthermore, the V
will also be greater than the original level, and the MCU might not accept "H" inputs.
• The user power supply monitoring function cannot be used on the emulator. However, although
this product is equipped with a UVDDE indicator LED, this cannot be used to detect transient
power stoppages (the emulator can detect user resets due to transient power stoppages).
• The emulator treats disconnection of the user power supply as input of a user reset.
• The power supply of the user system can only be disconnected when the evaluation MCU is
in trace mode (executing). The operation is not guaranteed if the power supply is disconnected
while in emulation mode. After the power is turned back on, the MCU will start in trace mode
and program execution will begin with the reset sequence of the user system.
• If the power supply is disconnected during a break, the MCU does not reset because the user
reset is masked by the emulator. The MCU output pins therefore all maintain the same output
state, and there is a risk that the user system will be damaged. To prevent this, reset the MCU
using the emulator reset command before turning off the power.
• If UVDDE drops below the monitor reference voltage while in stop mode, a reset is applied
and the oscillator circuit begins oscillating. The MCU can therefore be started in this situation
simply by returning UVDDE to the operating voltage without applying a user reset or gener-
ating an interrupt. Furthermore, an interrupt cannot be used to recover from stop mode in this
situation because the reset has already been applied.
• Port pins on the user system are required to maintain a weak "L" level when the user power
supply is off (required to be equivalent to a pull-down resistance below V
• Because a user reset is asserted when the emulator power supply is turned on, the monitor is
not ready until the user system power supply has powered up.
• From the point of view of the emulator, all disconnections of the user system power supply
are viewed as user reset inputs. The operational specifications of the user resets are as noted.
• Software breakpoints cannot be used on memory in the user system during power-on debug-
ging.
, if a voltage less than or equal to V
S
of the MCU will be calculated from V
OH
S
, and
S
level of the MCU
IH
/I
of the MCU).
IL
IL
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