100 MHz Cortex-M4 with 256 KB Flash — what it means for the BOM
The MK20DX256VLL10 is a 32-bit ARM Cortex-M4 MCU clocked at 100 MHz, with 256 KB of Flash and 64 KB of RAM.
Connectivity and peripherals — what is on the bus
This MCU carries USB OTG (dual-role host/device), CANbus, and an external bus interface (EBI/EMI) alongside the usual SPI, I²C, and UART blocks. The USB OTG is useful for designs that need to talk to a USB flash drive for data logging or act as a USB device for firmware updates. CANbus is the standard for industrial automation and automotive sub-systems; having it on-chip saves an external CAN controller. The EBI/EMI can connect parallel NOR Flash, SRAM, or an FPGA — useful if the 64 KB internal RAM is tight and you need a frame buffer or co-processor memory. The 33-channel 16-bit ADC covers enough analog inputs for multi-axis sensor arrays or power-monitoring channels. The single 12-bit DAC is there for one analog output — setpoint generation or waveform synthesis, not multi-channel control. On-chip peripherals include DMA, I²S (for audio codec interface), LVD (low-voltage detect), POR (power-on reset), PWM, and a watchdog timer. The DMA engine can move ADC results or serial data without CPU intervention, which helps keep the 100 MHz core free for control math.
Package and footprint
The MK20DX256VLL10 comes in a 100-pin LQFP (14x14 mm body) with 66 general-purpose I/O brought out.