The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52 .

Arduino, the world's leading open-source hardware and software platform, today announced the launch of its next-generation UNO board, a significant re ...

Arduino intends to provide a public list of such libraries, with links to alternatives. To aid library developers in porting low-level code to the Renesas architecture, there is and early-adopter ...