PIC18F87J60 microcontroller. It features IEEE 802.3™ Compatible Ethernet Controller with integrated MAC and 10Base-T PHY. It supports one 10Base-T port with activity outputs for 2 LED indicators. Ethernet controller features programmable automatic retransmit on collision and programmable automatic rejection of erroneous packets. Microcontroller has up to 10 MIPS operation, 128K bytes of linear program memory, 3808 bytes of linear data memory, 8192 of ethernet RX/TX buffer and lot of internal modules.
25MHz crystal oscillator. We carefully chose the most convenient crystal value that provides clock frequency which can be used directly, or with the PLL multipliers and dividers to create higher MCU clock value.