(SuperTexas Components)The STC90C52RC-40I-PLCC44G with STC PLCC-44 RoHS is an 8-bit microcontroller from STC (SuperTexas Components). It has on-chip 64KB program memory and 384 bytes of RAM, four 8-bit parallel ports, one 16-bit timer, two 16-bit counters, one UART, on-chip clock oscillator, and three independent 16-bit timers. It is manufactured in a PLCC-44 RoHS (Restriction of Hazardous Substances) package and is pin-to-pin compatible with the 80C51 family. The device is integrated with different features such as the on-chip program memory and random access memory (RAM) which can be used for data storage and data processing operations. It also supports a variety of peripherals including a PWM module, analog-to-digital converter, SPI, I2C, CAN, and 3 SPI channels. Its 40-MHz oscillator frequency enables the device to run at a maximum operating frequency of 40MIPS.