Parameter: Microcontroller chip: ATmega128A AD conversion reference voltage plus filter inductors, capacitors Through the jumper to select different frequency external crystal All IO ports are exported and marked Both ISP and JTAG interfaces are exported and marked Reliable reset circuit PA1, PA0 leads to two LEDs for easy testing DC block or pin 5V power supply PCB board size: 52.3mmx80mm Package Included: 1 * ATmega128 Core Expansion Board