ARM Cortex-M4 at 50 MHz — what the core speed means for the BOM
The MK20DX32VMP5: 32-bit ARM Cortex-M4 MCU clocked at 50 MHz. 32 KB Flash, 8 KB RAM, and 2 KB EEPROM.
Memory sizing — Flash, RAM, and the EEPROM differentiator
The EEPROM handles byte-level writes without sector erase cycles.
Connectivity and analog — USB OTG and 16-bit ADC
USB OTG supports host and device roles. Serial interfaces include UART, SPI, I²C, and IrDA. 13-channel 16-bit ADC. Peripheral set includes DMA, I²S, LVD, POR, PWM, and WDT. The DMA offloads the Cortex-M4 for block transfers (USB packets, ADC scan results). I²S routes digital audio to a codec if the application needs voice prompts or acoustic monitoring.