What this part is — and where it fits
The LM3S5C56-IQR80-A2T is a 32-bit ARM Cortex-M3 MCU from TI's Stellaris 5000 series, clocked at 80 MHz with 512 KB Flash and 64 KB RAM. It carries a full set of industrial connectivity — CAN, USB OTG, UART/USART, SPI, I2C, LIN, IrDA, and QEI for quadrature encoder inputs — plus an 8-channel 12-bit ADC. The 64-LQFP package (10x10 mm) and -40 to 85°C temperature range make it a fit for factory automation, motor control, CAN-based fieldbus nodes, and multi-protocol gateway designs where a single MCU handles both control and communication.
80 MHz Cortex-M3 — what the speed buys you
The 80 MHz core runs a real-time control loop while handling CAN and USB traffic. The 512 KB Flash and 64 KB RAM support multiple protocol buffers without external memory.
Obsolete — sourcing reality
Connectivity and peripheral set — what's on the chip
The LM3S5C56 integrates a CAN controller, USB OTG, and serial interfaces: UART/USART, SPI, SSI, I2C, Microwire, IrDA, and LIN. The QEI reads motor position from incremental encoders without bit-banging.