80 MHz Cortex-M3 — what the speed means for the control loop
The LM3S5P31-IQC80-C0: The LM3S5P31 is a Texas Instruments Stellaris ARM Cortex-M3 MCU, 32-bit single-core at 80 MHz, with 64 KB Flash and 24 KB RAM. It carries a full connectivity suite — CANbus, USB, LIN, I²C, SPI, SSI, UART — plus a 16-channel 10-bit ADC and internal oscillator. The 100-LQFP package (14x14 mm) exposes 67 I/O. Rated for -40°C to 85°C industrial temperature range on a 1.08 V to 1.32 V core supply.
Memory budget — where 64 KB Flash and 24 KB RAM land this part
64 KB Flash and 24 KB RAM place this MCU in the mid-density tier of the Stellaris 5000 family. It fits control applications with moderate firmware — motor-control loops, CAN gateway protocol stacks, or USB-to-serial bridges.
Connectivity and peripherals — what the bus set covers
CANbus, USB, LIN, I²C, SPI, SSI, UART, IrDA, Microwire, and QEI are all on-chip. The 16-channel 10-bit ADC and PWM with dead-band support suit motor-drive feedback and sensor acquisition. Brown-out detect, POR, and DMA are built in. The internal oscillator eliminates an external crystal for many applications, though precision timing still benefits from an external source. The 67 I/O in a 100-LQFP leave room for parallel displays or memory interfaces if needed.