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. - Maple pins map full compatible for Arduino shield SPI Interface up to 10 MHz - 72MHz ARM Cortex M3 core; 20KB SRAM and 128KB Flash - 7 channels of Direct Memory Access(DMA) - Wide range external input from and USB supply adaptive - X-link / X-link Ex full compatible - Operating Voltage: DC 3-12V - Dimensions: 68.3mm x 54.3mm