This particular electronic part is a 4KB 208Byte OTP 26 RISC SOP-28-300mil Microcontroller Unit (MCU/MPU/SOC) from the PADAUK company, with the model number PMC234-S28, and manufactured in accordance with the Restriction of Hazardous Substances Directive (ROHS). It is designed for use in various applications, such as communication, multimedia, and consumer electronics. The MCU has a 26-bit RISC CPU that is capable of executing up to three instructions per step, and features an integrated on-chip program memory with 4KB of OTP capacity for user programs, as well as 208 bytes of RAM and 131 bytes of SFR. It also features a wide selection of GPIOs and built-in peripherals, including an A/D converter, UART, timers, and a PLL for clock generation. In addition, the MCU is provided in a small SOP-28-300mil package that is easily embedded onto circuit boards.