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RL78/G23-128p Fast Prototyping Board
6. Handling Precautions
6.1
Power to be Supplied
When power is supplied to this product from an emulator or through the USB, note that the total current of
VDD, EVDD, 5 V, and 3.3 V should not exceed the maximum current of 200 mA.
6.2
Remodeling the Board
Any modification of the board (including removing the patterns for cutting) shall be conducted at the user's
own responsibility.
The following shows the settings of jumpers as shipped.
•
J17: open-circuit
•
J20: pins 1-2 are short-circuit
6.3
Power Supplies and Usage Conditions
Different power supplies can be selected. Table 6-1 shows the relationship between power-supply sources
and usage conditions.
Figure 6-1 shows the block diagram of the power-supply circuit.
Table 6-1 Power-Supply Sources and Usage Conditions
Power-Supply
Source
Power
supplied to
the
evaluation
MCU
4
USB*
5 V or 3.3 V
(default)
External power
1.6 V to 5.5 V Possible
supply
Emulator
E2 Lite: 3.3 V
E2: 1.8 V to
5.0 V
Notes: 1. Connecting the RL78/G23-128p Fast Prototyping Board to an Arduino shield, a Pmod module, or a Grove
module shall be conducted at the user's own responsibility and should only proceed after confirming the
specifications of the power supply and interfaces. When an Arduino shield requires the supply of 5-V or 3.3-
V power, connect the host PC to this board via the USB cable.
2. Requirements for modifications after shipment are stated in this column.
3. Use the IDE in a state where power is being supplied from a source other than the emulator.
4. If power to be supplied to this product other than via the USB, remove the pattern for cutting (VCCIO).
R20UT4870EJ0100 Rev. 1.00
Sep.16.21
Use of
Use of
Arduino
Pmod or
1
shields*
Grove
modules*
Possible
Possible
Possible
Not possible
Possible
Usage Condition
Use of an
emulator and
IDE
1
3
Possible*
Not required
•
J20: 1-2 short-circuit: 5 V (default)
Required
•
J20: 2-3 short-circuit: 3.3 V
3
Possible*
Not required
•
J20: open-circuit
Possible
Not required
•
J20: open-circuit
6. Handling Precautions
*2
Jumper setting
Page 28 of 43
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