STK600 AVR® Flash MCU Starter Kit Atmel / Microchip STK600 AVR® Flash MCU Starter Kit is a complete starter kit and development system for 8-bit and 32-bit AVR Flash microcontrollers. The STK600 Starter Kit features a modular design, using separate Routing Cards and Socket Cards, which route the signals from the device to the appropriate hardware. The Routing Card and Socket Card for a specific device are not included and must be purchased separately.