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RL78/G22 Fast Prototyping Board
5. User Circuits
5.1
Evaluation MCU
The specifications for the power supply, system clock, and reset of the evaluation MCU (RL78/G22) at the
time of shipment are as follows.
Power supply: 5 V (VBUS) supplied from the USB (including the analog power supply)
•
System clock: Operation with an on-chip oscillator
•
Reset: Directed by the reset switch or IDE
•
5.2
USB Connector
The connector shape is micro-USB Type-B. It serves as a power-supply input and an interface for
communications with the RL78 COM port debug tool (through USB-to-serial conversion). Connect the USB
connector to the host PC by a USB cable. If the power supply on the host side is on, the power is supplied to
this product at the same time as connection of the cable.
Note: The package does not include a USB cable. Do not connect a USB cable while the emulator is
supplying power.
5.3
Power LED
While the power LED is illuminated, VDD power is being supplied. The LED is green.
Note: The LED may not be illuminated when the power supply voltage is 2.2 V or lower.
5.4
User LEDs
The optional user LEDs can be used for any purpose. LED1 and LED2 are mounted on the board and are
respectively connected to the following ports. The LEDs are green.
LED1: Pin 3, connected to port P62
•
LED2: Pin 4, connected to port P63
•
Note: The LED may not be illuminated when the power supply voltage is 2.2 V or lower.
5.5
Capacitive Touch Buttons and Touch Slider
The capacitive touch buttons and touch slider can be used for the user's desired purpose. Two electrodes
(touch button 1 and touch button 2) and one slider (with a three-electrode configuration) are mounted on the
board and are respectively connected to the following ports.
Touch button 1: Pin 26, connected to ports P26, TS24, and CAP1
•
Touch button 2: Pin 27, connected to ports P25, TS23, and CAP2
•
Slider: Pin 30, connected to ports P22, TS20, and CAP3
•
Pin 29, connected to ports P23, TS21, and CAP4
Pin 28, connected to ports P24, TS22, and CAP5
P30 (pin 12) is connected for the TSCAP pin function by default.
Note: The condition for operating voltage of CTSU2La is VDD = 1.8 V to 5.5 V. Use capacitive touch buttons
that produce voltages within the range VDD = 1.8 V to 5.5 V.
R20UT5121EJ0100 Rev. 1.00
Nov.16.22
5. User Circuits
Page 8 of 35
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