SPMC65P2404A and SPMC65P2408A are the members of 65X series and OTP (One Time Program) solutions. SPMC65P2408A is a superset of SPMC65P2404A. These two devices share similar cores and peripherals with the following exceptions. For example, SPMC65P2404A does not have UART interfaces, Port C Bit[5:4], Port D Bit[4:3], and compare function on timer 2. In addition, ROM and RAM sizes on the SPMC65P2404A are less than on SPMC65P2408A. For detailed memory information, please refer to the following section. Major application fields are small home appliance, industry controller, and battery charger. Main features of these two devices are depicted in the next section.