50 MHz Cortex-M3 with CAN — what it covers
The Texas Instruments LM3S2678-IQR50-A0T is a Stellaris ARM Cortex-M3S 2000 series microcontroller built around a 32-bit ARM Cortex-M3 core running at 50 MHz. The peripheral set includes CANbus, IrDA, Microwire, QEI, SPI, SSI, and UART/USART — so it can bridge a CAN-based fieldbus to a local sensor cluster over SPI or a debug UART. This is a mid-range MCU for industrial control nodes, motor-drive comms, or building-automation gateways that need CAN without stepping up to a larger package or higher pin count.
NRND — plan the last buy or the migration
That means TI is not actively pushing this part into new sockets, and the production window is finite. For existing production, the NRND flag is the signal to secure a last-time-buy quantity or arrange a qualified second source through independent distribution.
The 64-LQFP package (10x10 mm) has 33 I/Os.
Peripherals and memory for a control node
Beyond CAN, the peripheral list includes a quadrature encoder interface (QEI) for motor position feedback, PWM for drive signals, and a watchdog timer. The 128 KB Flash is split into 1 KB sectors — fine for an OTA staging area if you manage wear leveling, though the 100k-cycle endurance is typical for this class. The 32 KB SRAM (32K x 8) holds a real-time OS heap and a couple of CAN message buffers without thrashing.