The Texas Instruments LM3S808-IQN50-C2 is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris series, clocked at 50 MHz with 64 KB of Flash program memory and 8 KB of SRAM.
At 50 MHz the ARM Cortex-M3 core delivers single-cycle multiply and hardware divide, which keeps interrupt latency tight for PID loops and encoder-edge counting. The 8 KB SRAM is sized for moderate data buffers — enough for a Modbus RTU frame or a few sensor logs — but not for large display frame stores or multi-protocol stacks.
Peripheral set and ADC for mixed-signal control
The 8-channel 10-bit ADC samples at rates adequate for current-sense and temperature-monitor inputs in motor-drive and power-supply feedback loops.