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RL78/G22 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*
4
5 V or 3.3 V
(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/G22 Fast Prototyping Board to an Arduino
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
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, cut the pattern for cutting (VCCIO).
5 V (VBUS)
USB
Micro B
R20UT5121EJ0100 Rev. 1.00
Nov.16.22
Use of
Use of
Arduino
Pmod or
shields*
1
Grove
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 an
emulator and
IDE
1
Possible*
3
Not required
J17: 1-2 short-circuit: 5 V (default)
•
Required
J17: 2-3 short-circuit: 3.3 V
•
Possible*
Required
3
•
J17: open-circuit
Possible
Required
J17: open-circuit
•
shield, a Pmod module, or a Grove
shield requires the supply of 5-V or 3.3-V
5 V
3.3 V
IOREF
VIN
5 V
1
VDD
2
3.3 V
3
Power-supply
selection
header (J17)
VDD
6. Handling Precautions
Jumper setting
*2
Arduino
TM
Pmod
Grove
RL78/G22
Emulator
(Pin J18-1:
VDD)
External
power supply
(Pin J18-2:
VSS)
Page 29 of 35
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