The GDMC191S20B is an Other Processors and Microcontrollers (MCUs) SOP-20 RoHS manufactured by BYD. This device features a 32-bit ARM Cortex M3 processor with a memory of 4KB RAM and 16KB Flash. It is equipped with a CAN, UART, SPI, I2C, and PWM interfaces and has an operating temperature range of –40° to 125°C. This MCU supports up to 256KB external Flash and 1024KB external RAM, and is Ideal for low-power industrial and home automation applications.