What the LM3S5B91-IQC80-C3 is and where it fits
The Texas Instruments LM3S5B91-IQC80-C3 is a 32-bit ARM Cortex-M3 MCU from the Stellaris 5000 series, clocked at 80 MHz with 256 KB of Flash program memory and 96 KB of SRAM. It carries CAN, USB OTG, multiple UART/USART, I²C, SPI, and SSI connectivity, plus a 16-channel 10-bit ADC. The 72 general-purpose I/O lines, combined with the EBI/EMI bus, allow direct attachment of external memory or parallel peripherals without a CPLD. The internal oscillator and brown-out detect circuitry reduce external BOM count in space-constrained designs.
80 MHz core — what it buys you on the bus
At 80 MHz, the Cortex-M3 pipeline delivers 96 KB of SRAM and a 16-channel 10-bit ADC.