The ATmega128 chip is mounted on a device board, which can be separated from the mother board. Hence, easily changing MCU is supported. 

The STK128+ Standard package comes with an ATmega128 device board, while the STK128+ Premium package comes with the standard package, an additional spare ATmega128 device board, an Experiment Fittings Pack, usb power connector.

• Power

  • Powered from external 5V power supply

  • Jumper for configuring voltage level to be applied, 5V/3.3V

• Onboard Chips

  • ATmega128 (TQFP64), MCU, mounted on the device board

  • AMS1117-3.3, on board regulator

  • MAX3232, True RS232 Transceivers

• Interfaces

  • Two RS232 connector for UART0 and UART1, DB9 standard

    • Guaranteed to operate under 3V level supply thanks to the MAX3232

    • UART0 and UART1 jumpers, short the jumper to connect UART to AVR MCU, open the jumper to vacate the I/O ports.

  • 6-pin / 10-pin ISP port

  • JTAG port

• Human to Machine Interface

  • RESET button, used to reset the MCU

  • Power indicator LED

  • 8 surface mounted LEDs, can be used as I/O status indicator

  • 8 Push-buttons, for analog input

• Other Features

  • Crystal configurable, there is a jumper for selecting on board 7.3728M crystal or external crystal mounted via the socket

  • All the MCU pins are accessible on expansion connectors for further expansion

  • All the pins are marked on the board. These marks describe the function of each pin

  • Compatible with several AVR MCUs:

    • Fully compatible with: ATmega64/ATmega128

    • Partly compatible with: ATmega1281/ATmega2561, AT90CAN32/AT90CAN64/AT90CAN128