80 MHz Cortex-M3 with 64 KB flash — where this part sits in the cycle
The LM3S5P31-IQC80-C5: This part is listed as obsolete by the manufacturer.
On-chip peripherals and connectivity mix
The MCU integrates 67 general-purpose I/O lines, a 16-channel 10-bit ADC, and a peripheral set that includes CANbus, USB, multiple UART/USART, I²C, SPI, SSI, and IrDA interfaces. On-chip oscillators eliminate the need for an external clock source in many designs. Additional on-chip blocks include brown-out detect, POR, DMA, PWM, and a watchdog timer — enough to run a small control loop or communication gateway without external supervisory silicon.
Package and supply rails
The 0.50 mm pitch demands careful fan-out on the PCB — a 4-layer board is typical for routing all 67 I/O and the mixed-signal ADC traces.