Described here is the product concept. The most important concept of the RX660 is that it supports a 5V power supply. It has stronger noise immunity than 3V MCU products. The 5V MCU has less noise trouble. The CPU has an RXv3 core and speed is 120MHz. Since there is no memory access wait time, stable and high-speed operations can be performed. ROM size is up to 1MB and RAM size is 128kB. Peripheral functions include an infrared remote control receiver function, which is not available in competitor products, and CAN FD, for which demand has been increasing recently. The PKG lineup is 48-pin to 144-pin. This product has more than 10% GPIO pins than the existing RX products. Customers will not have GPIO pin count shortage. It is pin-compatible with RX general-purpose products such as RX210, RX130, and RX651, so replacement is easy. Most of the competitor's products are guaranteed with a 1% accuracy of HOCO by only design spec and have not been tested, so customers do not know if HOCO accuracy would achieve 1% when the MCU is mounted on a board. However, the RX660 can achieve a high accuracy of 1% or less even when MCU is mounted on a board.