Stellaris Cortex-M3 MCU — 50 MHz, 256 KB Flash, industrial temperature
The LM3S1969-IQC50-A2T: It runs at 50 MHz, with 256 KB of program Flash and 64 KB of SRAM, and includes a 8-channel 10-bit ADC, plus serial interfaces covering I2C, SPI, SSI, UART/USART, IrDA, and Microwire.
At 50 MHz, this Cortex-M3 delivers enough throughput for real-time control loops, sensor fusion, and protocol handling without requiring external memory or a cache. The 256 KB Flash can hold a moderate firmware image with a bootloader and application code, while the 64 KB SRAM handles stack, heap, and data buffers for serial communication or ADC samples.
The internal oscillator reduces external component count, though an external crystal can be used for tighter timing.