In summary, the RX660 series is the first 5V compatible product among the RX600 and RX700 high-end general-purpose microcontrollers. With this 5V support, it gives excellent noise tolerance and does not require any external coils for noise suppression, which contributes to the reduction of the overall system cost. The RXv3 core operates at 120MHz with no wait access to the Flash memory, resulting in stable arithmetic processing and achieving excellent real-time performance. The number of effective general-purpose I/O pins has been increased by approximately 10% from the previous 5V compatible RX210, enabling an increase in the number of sensors that can be connected with the same package, contributing to easier system upgrades.