25 MHz core — what it means for throughput
At 25 MHz, the core delivers about 25 MIPS — enough to handle USB interrupt transfers, real-time sensor polling, and small control loops. The DMA controller can move USB packet payloads directly to RAM.
Memory budget and USB role
24 KB of Flash and 6 KB of RAM set a clear application boundary: this part fits a USB-to-serial bridge, a data-logging front-end with local buffering, or a simple HID-class device. It will not run a USB mass-storage stack with a file system — the RAM is too tight for large sector buffers.
