16-bit MSP430 with USB — what the 25 MHz and memory mean for your BOM
It packs 16 KB of Flash and 6 KB of SRAM, which together define the firmware and data buffer ceiling for your application — a common pitfall is assuming the Flash can hold a USB stack plus application code without checking the 16 KB limit first. The 6 KB SRAM, organised as 6K x 8, handles the packet buffers and stack frames; if your design queues USB transactions, budget that space carefully.
USB device controller — the feature that sets this part apart
Not every MSP430 in the F5xx family includes a USB module. If your design needs a USB link for firmware update, data logging, or HID-class communication, this part saves an external USB-to-serial bridge. The 31 GPIO lines remain available even with USB active, though the D+ and D- pins are dedicated.