MicroThe STC8A4K32S2A12-28I-LQFP64 is an 8-bit microcontroller unit manufactured by STC Micro and is RoHS compliant. It is designed for use in embedded systems and has a multi-layer QFN package that is 64 pins in size, arranged in a 10 x 10 matrix. The processor core is an STC8A, based on the Harvard architecture 8-bit 25 series instruction set. The device has 32K bytes of Flash program memory, 2K bytes of SRAM, 23 I/O ports, five 16-bit timers, SPI and I²C interfaces, a 16-channel 10-bit ADC, 5-channel PWM/Timer/Capture, and WDT reset. It operates at frequency range of 3.3/2.5V at 28- MHz.