50MHz Cortex-M3 with 384KB flash — the scorch-mark tells you this one powered the display controller
The LM3S1F11-IQC50-A1 is a Texas Instruments Stellaris ARM Cortex-M3S 1000 series microcontroller, a 32-bit single-core part clocked at 50MHz with 384KB of program flash and 48KB of SRAM. The 384KB flash is enough for a moderate application stack plus a bootloader; the 48KB RAM leaves room for a real-time OS heap and frame buffers for a small TFT display or a serial protocol buffer. The 67 GPIOs break out through the 100-LQFP, giving plenty of headroom for parallel buses and discrete I/O.
Peripheral set and supply rail
Connectivity includes EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, and UART/USART — enough to talk to external memory, sensors, actuators, and a CAN transceiver through the LIN interface. The core runs on a 1.235V to 1.365V supply rail — a narrow window that demands a precision regulator. Brown-out detect and POR are built in, so the reset circuit is simpler than on parts without them. The internal oscillator means you can bring up the UART without an external crystal, though the accuracy is lower than a canned oscillator.
Texas Instruments has marked the LM3S1F11-IQC50-A1 as Obsolete. If you are repairing a board that has this part, the scorch mark tells you which one died — and the replacement is the same order code. For new designs, a board spin is required to migrate to a current Cortex-M3 or M4 part from TI or a competitor.