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RL78/G24 Fast Prototyping Board
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 6-2 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
USB*
5 V or 3.3 V
4
(default)
External power
1.6 V to 5.5 V
supply
Emulator
E2 Lite: 3.3 V
E2: 1.8 V to
5.0 V
Notes: 1. Connecting the RL78/G24 Fast Prototyping Board to an Arduino
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
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, cut the pattern for cutting (VCCIO).
5 V (VBUS)
USB
Micro B
R20UT5091EJ0100 Rev. 1.00
Apr.16.23
Use of
Arduino
1
shields*
modules*
Possible
Possible
Possible
Possible
Not possible
Possible
5 V
LDO
VCCIO
FTDI
Figure 6-2 Block Diagram of the Power-Supply Circuit
Usage Condition
Use of
Use of an
Pmod or
emulator and
Grove
IDE
1
Possible*
3
Possible*
3
Possible
shield, a Pmod module, or a Grove module
shield requires the supply of 5-V or 3.3-V power,
5 V
1
VDD/EVDD
2
3.3 V
3
Power-supply
selection
header (J16)
EVDD
6. Handling Precautions
Jumper setting
Not required
J16: 1-2 short-circuit: 5 V (default)
•
Required
J16: 2-3 short-circuit: 3.3 V
•
Required
•
J16: open-circuit
Required
•
J16: open-circuit
5 V
3.3 V
Arduino
IOREF
VIN
TM
Pmod
Grove
RL78/G24
Emulator
(Pin J17-1:
VDD)
External
power supply
(Pin J17-2:
VSS)
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