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Supports Full and Half-Duplex modes Automatic Programmable Retransmit on Collision Programmable Padding and CRC Generation Automatic Rejection of Erroneous Packets SPI Interface with Clock Speeds Up to 20 MHz The board 25MHZ crystal. The network interface board HR911105A. 5 V power supply pin. Stable performance. For Arduino SPI, AVR, PIC, LPC, STM32.