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RL78/G24 Fast Prototyping Board
5. User Circuits
5.12
USB-to-Serial Converter and COM Port Debugging
A USB-to-serial converter (FT232RQ) from FTDI is mounted on the board and is usable with the standard
driver of Windows 10. For other operating systems or drivers, install the driver by downloading from the
following Web site of FTDI.
http://www.ftdichip.com/
DRIVERS -> VCP Drivers
The USB-to-serial converter reset header (J14) is open-circuit; it is recognized as a COM port when the host
PC is connected to this board via a USB cable.
As the interface with the RL78 COM port debug tool, the USB-to-serial converter enables debugging and
programming of the evaluation MCU. Refer to Chapter 7, Developing Code. Note that the P40, P50, and P51
pins of the evaluation MCU are respectively occupied as the TOOL0, TOOLRxD, and TOOLTxD functions.
For the method of COM port debugging, refer to the application note, RL78 Debugging Functions Using the
Serial Port (R20AN0632).
When the USB-to-serial converter is not used as the interface with the RL78 COM port debug tool, using the
RxD0 and TxD0 functions of the P50 and P51 pins enables UART communications between the host PC and
the evaluation MCU. The user needs to prepare the terminal software, such as TeraTerm.
R20UT5091EJ0100 Rev. 1.00
Page 20 of 36
Apr.16.23
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