Renesas RL78/G1D, Руководство пользователя

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RL78/G1D Evaluation Board
R30UZ0048EJ0130 Rev.1.30 Page
10
of
22
Dec. 1, 2015
5.3 LEDs
The LEDs on the evaluation board are turned off when a high level is output to the corresponding general-purpose
port and turned on when a low level is output.
Table 5-3 shows the relationship between the LEDs and the RL78/G1D module ports.
Table 5-3 LED
Pin No. Port
LED1 CN1-23 P120
LED2 CN1-11 P147
LED3 CN1-9 P03
LED4 CN1-7 P60
Remark: The LEDs become dim when the voltage is 2.2 V or lower.
5.4 USB Interface
By using a UART-USB conversion device, the evaluation board can use UART0 on the RL78/G1D to communicate
with an external device. To communicate with a computer, connect a USB cable (A type male or mini-B male) to
the CN3 connector. Communication with a computer does not require flow control.
A circuit to detect connection to a computer is also provided. When a low level is input to general-purpose port P30
on the RL78/G1D module, it indicates that the evaluation board is connected to the computer. When a high level is
input, it indicates that the evaluation board is not connected.
When not using the USB interface, set the slide switch SW9 to '1-2 connected' and SW13 to '2-3 connected'; these
disconnect the buffer power supply and prevent leak current flowing from the signal level conversion buffer
between the RL78/G1D and UART-USB conversion IC.
Table 5-4 shows the relationship between the USB interface and the RL78/G1D module ports.
Table 5-4 USB Interface
Pin No. Port
UPON
(VBUS detection)
CN1-22
P30
TxD CN1-12 P12
RxD CN1-10 P11
To communicate with an external device via the USB interface by using UART0 of RL78/G1D, a UART-USB
conversion device driver must be installed in the computer. Install the driver referring to the appendix in this
document.
For detailed specifications of UART-USB conversion, see the manual of the UART-USB conversion IC FT232RL
(manufactured by Future Technology Devices International Ltd. in the UK).