Reset Switch; User Switch; Usb-To-Serial Converter And Com Port Debugging - Renesas RL78/G22 User Manual

Fast prototyping board

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RL78/G22 Fast Prototyping Board

5.11

Reset Switch

Pressing the reset switch (RST) applies a hardware reset to the evaluation MCU.

5.12

An optional user switch (SW) is mounted. It is connected to pin 43 of the evaluation MCU, which operates as

pin function P137. The INTP0 interrupt is multiplexed on the same pin.

5.13

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, install the driver by downloading from the following Web

site of FTDI.

http://www.ftdichip.com/

The USB-to-serial converter reset header (J15) 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, P11, and P12

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 P11 and P12 pins enables UART communications between the host PC and

the evaluation MCU. The user needs to prepare the terminal software, such as TeraTerm.

R20UT5121EJ0100 Rev. 1.00

Nov.16.22

DRIVERS -> VCP Drivers

5. User Circuits

Page 19 of 35

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