ML51XB9AE - Nuvoton

Description: embedded with based on 1T 8051-based CMOS microcontroller, runs up to 24 MHz at a wide voltage range from 1.8V to 5.5V, and features 16 KB flash, 1 KB SRAM, and 4 KB loader ROM for the ISP. It is also equipped with plenty of peripheral devices, such as up to 17 GPIO, Timers, Watchdog Timer, Window Watchdog Timer, UART, SPI, I²C, PWM Timer, 12-bit ADC, and available in QFN20