64 KB FRAM — the non-volatile memory that writes like RAM
That means you can treat it like RAM for data logging and still have it hold state across power loss. Backed by 2K x 8 of conventional SRAM for stack and scratchpad. Surface-mount 48-VFQFN with exposed pad (7x7 mm VQFN), 40 I/O lines.
16 MHz — enough throughput for real-time control loops
The 16 MHz core speed is the timing anchor for this part. For a 16-bit RISC pipeline, that translates to roughly 16 MIPS. It handles sensor fusion loops, Modbus polling, and closed-loop PID at update rates in the tens of kilohertz. If your application needs USB or a display controller, this isn't the core — it's built for low-power edge processing where 16 MHz is plenty and every extra megahertz costs battery life. For precision timing or a real-time clock, the internal oscillator is adequate for UART baud rates and general housekeeping, though a crystal can be added via the I/O pins.