The RX621 Group is built around the RX core and is equipped with 2 channels of USB 2.0 full-speed (Host, Function and OTG) and 1 channel of CAN as a communications interface. The products are designed to not put a restriction on applications based on their communication method; add-ons are used to achieve different communication methods. They are also equipped with a rich set of system fail-safe functions such as power-on reset (POR), low voltage detection (LVD), and an independent watchdog timer.