GR-COTTON

Overview

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.

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

Resources

Schematic/Design

gr-cotton_schematic_20160114_001.CE3 (PDF)
BOM List
GR-COTTON Layout (PDF)

Sketch Reference

GR-COTTON 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.

Click to download. Import the archive file (zip) as an existing workspace from the menu 'File' -> 'Import' in e² studio.
Cotton Sketch v204-e2v7 Project File (ZIP)

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.