72 MHz Cortex-M4 with 256 KB Flash — integrator's field note
The MK20DX256VMC7 is a 32-bit ARM Cortex-M4 MCU clocked at 72 MHz, with 256 KB Flash and 64 KB RAM. It carries a 2 KB EEPROM block for parameter storage without external EEPROM. The 70 I/O lines and rich peripheral set — CANbus, USB OTG, EBI/EMI, multiple SPI/I²C/UART — cover most control and communication needs in a single chip.
The 72 MHz Cortex-M4 core handles sensor fusion loops and basic DSP without a separate coprocessor. The 2 KB EEPROM stores calibration constants and failsafe parameters without wear-leveling code. The internal oscillator reduces external BOM count, though an external crystal improves USB clock accuracy for full-speed operation.