This is an extremely simple GUI for calculating ideal configuration register values for serial communications (UART, SPI, I2C) on Renesas RX microcontrollers It’s based on the information in the RX62N/RX621 user’s guide, but may apply to other chips as well. Given the target bit rate and CPU clock, it generates the configuration register values which yield the smallest error.

Download source package for Visual Studio 2010.

Includes binaries for .NET 4 or better (see bin subdirectory), should work correctly under Mono without modification.

Web calculator

Considering how simple the above program is and how limited its utility is, I ported it to Javascript so it can be run in a web browse. Embedded below, or standalone