GR-COTTON is a white and round board that has full-color LEDs to link between light and design. You can use a CR2032 battery and write a program via USB cable. Designers can check the operation using an LED and create a gadgets smoothly.

In addition, programming with this board is compatible with Arduino libraries.

GR-COTTON Key Features

  • Embeds a Renesas RL78/G13 group 16-bit microcontroller
  • The socket for CR2032 is mounted on the reverse side

GR-COTTON Pin Map

Detailed Specification

Microcontroller
RL78/G13 (R5F100GJAF B 48-pin QFP)
ROM/RAM
256KB/20KB
Data Flash
8KB
Main Clock
32MHz (internal)
Sub Clock
32.768kHz
Operating Voltage
3.3V*

* The operating voltage of MCU is from 1.8V to 5.5V

Schematic/Design

Sketch Reference

Creating & Writing Programs (Sketches)

There are several programming projects that can be done using the GR-COTTON board, including:


Project File for e2 studio

Project file for sketching in the Eclipse-based development environment e2 studio. For downloading and installing e2 studio, please refer to the e2 studio product page.

Note: This is a project exported in e2 studio Version 5.4. It cannot be imported successfully in Version 6.0. For later versions please check that the import is compatible.

Technical Support

Technical Information

Related Websites

GR-COTTON Board Distributor