EFmaple is a microcontroller board based on Leaf Maple. The EFmaple can achieve the maximum 72 MHz, it has 39 digital input/output pins, 16 analog inputs, native full speed USB, 3 USARTs (hardware serial ports), integrated SPI/I2C support, with power jack, and reset button. EFmaple is programmable over USB via a provided DFU bootloader, no extra hardware required! Users can also program the onboard program flash via external X-link/X-linkEx JTAG interface. EFmaple offers security support for read/write protected addresses, as well as User and Handler processor modes.EFmaple can be powered by USB or external power supply.