The STC12C5A08S2 is an STC microcontroller with a QFP-44-10x10x0.8P RoHS package, primarily manufactured by STC. It is a 12-bit single-chip microcontroller with 64KB Flash memory, previously known as the 80C52. It has a 2-256K external program memory size and a 1KB internal RAM. The device uses a power supply voltage of 2.7-3.6V and has an operating frequency of up to 24MHz. It features 4 8-bit timers/counters, 3 16-bit timers/counters, and 8 interrupt sources. Additionally, it has an 8051 compatible set of instructions with 6 I/Os, 8K ROM size, 6 interrupt sources, and 10 bytes DMA address buffers. The device offers various peripherals such as UART, SPI, I2C, and PWM for communication and power management purposes.