What the 20 MHz core and 128 KB Flash mean for your BOM
The 20 MHz clock is the sweet spot for battery-operated instrumentation and portable medical devices: it delivers enough throughput for 12-bit ADC conversions at tens of kSPS and USB full-speed communication while keeping dynamic current low enough that a CR2032 coin cell can power the system for months in sleep mode.
It is current-production from Texas Instruments, available through independent distribution for both prototype quantities and production volumes.