NuMicro® ML51 series is a Flash embedded 1T 8051-based microcontroller 1.8 ~ 5.5 V, 8-bit, 1T 8051-based low-power microcontroller (MCU) designed for a wide range of battery-powered devices. It belongs to Nuvoton's NuMicro ML51 series and operates at speeds up to 24 MHz.