Freescale-Freedom-Development-Platform-Freescale-FRDM-K20D50M-The-FRDM-K20D50M-is-an-ultra-low-cost-development-platform-enabled-by-the-Kinetis-K20-USB (Universal Serial Bus)-MCU-family-built-on-the-ARM-Cortex-M4-processor-Features-include-the-Freescale-open-standard-embedded-serial-&-debug-adaptor-Open SDA-providing-easy-access-to-MCU-I-O-battery-ready-low-power-operation-a-standard-based-form-factor-with-expansion-board-options-&-a-built-in-debug-interface-for-flash-programming-&-run-control-The-FRD