The STC15F102W is a low-cost 8-bit single-chip microcontroller (MCU) manufactured by STC Microelectronics. It is based on an enhanced single-chip 8051 core architecture with features such as 128 KB program memory, 4 KB RAM, a real-time clock module, and power management. It is packaged in SOP-8 and in accordance with RoHS standards. It has a fast instruction execution time and requires a minimum of peripheral components. It is commonly used for general-purpose applications such as consumer, communication, security, home automation, and industrial control. Most of the peripheral modules can work in both single-clock cycles and double-clock cycles, to achieve high performance yet lower power consumption.