NXP 恩智浦Kinetis K51: 72Mhz
Cortex?-M4 up to 288KB Flash 100/121pin
Kinetis K51: 72Mhz Cortex-M4 up to 288KB Flash 100/121pin K51P100M72SF1 K51 Sub-Family Supports: MK51DX256CLL7, MK51DX128CMC7, MK51DX256CMC7 Features ? Operating Characteristics – Voltage range: 1.71